diff --git a/pkgs/ffigen/CHANGELOG.md b/pkgs/ffigen/CHANGELOG.md
index 41ca1d5e78..928de48be1 100644
--- a/pkgs/ffigen/CHANGELOG.md
+++ b/pkgs/ffigen/CHANGELOG.md
@@ -21,6 +21,8 @@
   change to something more sensible.
 - __Breaking change__: Deleted the config option `Output.sort`. Sorting is now
   always enabled.
+- Fix(https://github.com/dart-lang/native/issues/2877) 
+  such that ObjCObject `isA` now accepts a nullable `ObjCObject?` and returns `false` when called with `null`, aligning its behavior with Dart’s `is`operator. 
 
 ## 20.1.1
 
diff --git a/pkgs/ffigen/example/objective_c/avf_audio_bindings.dart b/pkgs/ffigen/example/objective_c/avf_audio_bindings.dart
index 18187787e8..0d97511df9 100644
--- a/pkgs/ffigen/example/objective_c/avf_audio_bindings.dart
+++ b/pkgs/ffigen/example/objective_c/avf_audio_bindings.dart
@@ -563,11 +563,13 @@ extension type AVAudioPlayer._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [AVAudioPlayer].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_AVAudioPlayer,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_AVAudioPlayer,
+        );
 
   /// alloc
   static AVAudioPlayer alloc() {
diff --git a/pkgs/ffigen/example/swift/swift_api_bindings.dart b/pkgs/ffigen/example/swift/swift_api_bindings.dart
index 8d85a596cb..d349d8dc79 100644
--- a/pkgs/ffigen/example/swift/swift_api_bindings.dart
+++ b/pkgs/ffigen/example/swift/swift_api_bindings.dart
@@ -57,11 +57,13 @@ extension type SwiftClass._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [SwiftClass].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_SwiftClass,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_SwiftClass,
+        );
 
   /// alloc
   static SwiftClass alloc() {
diff --git a/pkgs/ffigen/lib/src/code_generator/objc_interface.dart b/pkgs/ffigen/lib/src/code_generator/objc_interface.dart
index 9fec93b2d5..32bb152fac 100644
--- a/pkgs/ffigen/lib/src/code_generator/objc_interface.dart
+++ b/pkgs/ffigen/lib/src/code_generator/objc_interface.dart
@@ -152,7 +152,9 @@ ${generateInstanceMethodBindings(w, this)}
 
     s.write('''
   /// Returns whether [obj] is an instance of [$name].
-  static bool isA($wrapObjType obj) => $isKindOfClass;
+  static bool isA($wrapObjType? obj) => obj == null 
+      ? false 
+      : $isKindOfClass;
 ''');
 
     s.write(generateStaticMethodBindings(w, this));
diff --git a/pkgs/ffigen/test/native_objc_test/is_instance_test.dart b/pkgs/ffigen/test/native_objc_test/is_instance_test.dart
index f315c2b3a5..d403a04ed9 100644
--- a/pkgs/ffigen/test/native_objc_test/is_instance_test.dart
+++ b/pkgs/ffigen/test/native_objc_test/is_instance_test.dart
@@ -48,5 +48,11 @@ void main() {
       expect(IsInstanceChildClass.isA(base), isFalse);
       expect(IsInstanceChildClass.isA(child), isTrue);
     });
+
+    test('Null input', () {
+      expect(IsInstanceBaseClass.isA(null), isFalse);
+      expect(IsInstanceChildClass.isA(null), isFalse);
+      expect(IsInstanceUnrelatedClass.isA(null), isFalse);
+    });
   });
 }
diff --git a/pkgs/objective_c/CHANGELOG.md b/pkgs/objective_c/CHANGELOG.md
index 4b3fdcf6e7..48d7f17353 100644
--- a/pkgs/objective_c/CHANGELOG.md
+++ b/pkgs/objective_c/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 9.4.0
+- Fix (https://github.com/dart-lang/native/issues/2877) such that all occurances of ObjCObject `isA` now accepts a nullable `ObjCObject?` and returns `false` when input is`null`
+
 ## 9.3.0
 - `autoReleasePool` now returns the value produced by its callback.
 
diff --git a/pkgs/objective_c/lib/src/objective_c_bindings_generated.dart b/pkgs/objective_c/lib/src/objective_c_bindings_generated.dart
index a4ccfbad53..6a7c19080c 100644
--- a/pkgs/objective_c/lib/src/objective_c_bindings_generated.dart
+++ b/pkgs/objective_c/lib/src/objective_c_bindings_generated.dart
@@ -671,11 +671,13 @@ extension type DOBJCObservation._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [DOBJCObservation].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_DOBJCObservation,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_DOBJCObservation,
+        );
 
   /// alloc
   static DOBJCObservation alloc() {
@@ -772,11 +774,13 @@ extension type DartInputStreamAdapter._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [DartInputStreamAdapter].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_DOBJCDartInputStreamAdapter,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_DOBJCDartInputStreamAdapter,
+        );
 
   /// alloc
   static DartInputStreamAdapter alloc() {
@@ -1011,11 +1015,13 @@ extension type DartInputStreamAdapterWeakHolder._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [DartInputStreamAdapterWeakHolder].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_DOBJCDartInputStreamAdapterWeakHolder,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_DOBJCDartInputStreamAdapterWeakHolder,
+        );
 
   /// alloc
   static DartInputStreamAdapterWeakHolder alloc() {
@@ -1128,11 +1134,13 @@ extension type DartProtocol._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [DartProtocol].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_DOBJCDartProtocol,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_DOBJCDartProtocol,
+        );
 
   /// alloc
   static DartProtocol alloc() {
@@ -1226,11 +1234,13 @@ extension type DartProtocolBuilder._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [DartProtocolBuilder].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_DOBJCDartProtocolBuilder,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_DOBJCDartProtocolBuilder,
+        );
 
   /// alloc
   static DartProtocolBuilder alloc() {
@@ -1381,11 +1391,13 @@ extension type NSArray._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSArray].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSArray,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSArray,
+        );
 
   /// alloc
   static NSArray alloc() {
@@ -1613,11 +1625,13 @@ extension type NSAttributedString._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSAttributedString].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSAttributedString,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSAttributedString,
+        );
 
   /// alloc
   static NSAttributedString alloc() {
@@ -2096,11 +2110,13 @@ extension type NSAttributedStringMarkdownParsingOptions._(
   }
 
   /// Returns whether [obj] is an instance of [NSAttributedStringMarkdownParsingOptions].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSAttributedStringMarkdownParsingOptions,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSAttributedStringMarkdownParsingOptions,
+        );
 
   /// alloc
   static NSAttributedStringMarkdownParsingOptions alloc() {
@@ -2337,11 +2353,13 @@ extension type NSBundle._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSBundle].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSBundle,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSBundle,
+        );
 
   /// URLForResource:withExtension:subdirectory:inBundleWithURL:
   static NSURL? URLForResource$3(
@@ -3220,11 +3238,13 @@ extension type NSCharacterSet._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSCharacterSet].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSCharacterSet,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSCharacterSet,
+        );
 
   /// alloc
   static NSCharacterSet alloc() {
@@ -3548,11 +3568,13 @@ extension type NSCoder._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSCoder].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSCoder,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSCoder,
+        );
 
   /// alloc
   static NSCoder alloc() {
@@ -4037,11 +4059,13 @@ extension type NSData._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSData].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSData,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSData,
+        );
 
   /// alloc
   static NSData alloc() {
@@ -4548,11 +4572,13 @@ extension type NSDate._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSDate].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSDate,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSDate,
+        );
 
   /// alloc
   static NSDate alloc() {
@@ -4793,11 +4819,13 @@ extension type NSDictionary._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSDictionary].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSDictionary,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSDictionary,
+        );
 
   /// alloc
   static NSDictionary alloc() {
@@ -5075,11 +5103,13 @@ extension type NSEnumerator._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSEnumerator].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSEnumerator,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSEnumerator,
+        );
 
   /// alloc
   static NSEnumerator alloc() {
@@ -5164,11 +5194,13 @@ extension type NSError._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSError].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSError,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSError,
+        );
 
   /// alloc
   static NSError alloc() {
@@ -8396,11 +8428,13 @@ extension type NSIndexSet._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSIndexSet].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSIndexSet,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSIndexSet,
+        );
 
   /// alloc
   static NSIndexSet alloc() {
@@ -8911,11 +8945,13 @@ extension type NSInputStream._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSInputStream].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSInputStream,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSInputStream,
+        );
 
   /// alloc
   static NSInputStream alloc() {
@@ -9085,11 +9121,13 @@ extension type NSInvocation._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSInvocation].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSInvocation,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSInvocation,
+        );
 
   /// alloc
   static NSInvocation alloc() {
@@ -9274,11 +9312,13 @@ extension type NSItemProvider._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSItemProvider].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSItemProvider,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSItemProvider,
+        );
 
   /// alloc
   static NSItemProvider alloc() {
@@ -10128,11 +10168,13 @@ extension type NSLocale._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSLocale].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSLocale,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSLocale,
+        );
 
   /// alloc
   static NSLocale alloc() {
@@ -10292,11 +10334,13 @@ extension type NSMethodSignature._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSMethodSignature].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSMethodSignature,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSMethodSignature,
+        );
 
   /// alloc
   static NSMethodSignature alloc() {
@@ -10423,11 +10467,13 @@ extension type NSMutableArray._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSMutableArray].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSMutableArray,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSMutableArray,
+        );
 
   /// alloc
   static NSMutableArray alloc() {
@@ -10771,11 +10817,13 @@ extension type NSMutableData._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSMutableData].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSMutableData,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSMutableData,
+        );
 
   /// alloc
   static NSMutableData alloc() {
@@ -11291,11 +11339,13 @@ extension type NSMutableDictionary._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSMutableDictionary].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSMutableDictionary,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSMutableDictionary,
+        );
 
   /// alloc
   static NSMutableDictionary alloc() {
@@ -11555,11 +11605,13 @@ extension type NSMutableIndexSet._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSMutableIndexSet].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSMutableIndexSet,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSMutableIndexSet,
+        );
 
   /// alloc
   static NSMutableIndexSet alloc() {
@@ -11764,11 +11816,13 @@ extension type NSMutableOrderedSet._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSMutableOrderedSet].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSMutableOrderedSet,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSMutableOrderedSet,
+        );
 
   /// alloc
   static NSMutableOrderedSet alloc() {
@@ -12283,11 +12337,13 @@ extension type NSMutableSet._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSMutableSet].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSMutableSet,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSMutableSet,
+        );
 
   /// alloc
   static NSMutableSet alloc() {
@@ -12519,11 +12575,13 @@ extension type NSMutableString._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSMutableString].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSMutableString,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSMutableString,
+        );
 
   /// alloc
   static NSMutableString alloc() {
@@ -13178,11 +13236,13 @@ extension type NSNotification._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSNotification].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSNotification,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSNotification,
+        );
 
   /// alloc
   static NSNotification alloc() {
@@ -13333,11 +13393,13 @@ extension type NSNull._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSNull].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSNull,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSNull,
+        );
 
   /// alloc
   static NSNull alloc() {
@@ -13431,11 +13493,13 @@ extension type NSNumber._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSNumber].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSNumber,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSNumber,
+        );
 
   /// alloc
   static NSNumber alloc() {
@@ -13996,11 +14060,13 @@ extension type NSObject._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSObject].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSObject,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSObject,
+        );
 
   /// alloc
   static NSObject alloc() {
@@ -15700,11 +15766,13 @@ extension type NSOrderedCollectionChange._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSOrderedCollectionChange].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSOrderedCollectionChange,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSOrderedCollectionChange,
+        );
 
   /// alloc
   static NSOrderedCollectionChange alloc() {
@@ -15965,11 +16033,13 @@ extension type NSOrderedCollectionDifference._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSOrderedCollectionDifference].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSOrderedCollectionDifference,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSOrderedCollectionDifference,
+        );
 
   /// alloc
   static NSOrderedCollectionDifference alloc() {
@@ -16260,11 +16330,13 @@ extension type NSOrderedSet._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSOrderedSet].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSOrderedSet,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSOrderedSet,
+        );
 
   /// alloc
   static NSOrderedSet alloc() {
@@ -16759,11 +16831,13 @@ extension type NSOutputStream._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSOutputStream].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSOutputStream,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSOutputStream,
+        );
 
   /// alloc
   static NSOutputStream alloc() {
@@ -16952,11 +17026,13 @@ extension type NSPort._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSPort].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSPort,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSPort,
+        );
 
   /// alloc
   static NSPort alloc() {
@@ -17329,11 +17405,13 @@ extension type NSPortMessage._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSPortMessage].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSPortMessage,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSPortMessage,
+        );
 
   /// alloc
   static NSPortMessage alloc() {
@@ -17454,11 +17532,13 @@ extension type NSProgress._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSProgress].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSProgress,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSProgress,
+        );
 
   /// addSubscriberForFileURL:withPublishingHandler:
   ///
@@ -18325,11 +18405,13 @@ extension type NSRunLoop._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSRunLoop].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSRunLoop,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSRunLoop,
+        );
 
   /// alloc
   static NSRunLoop alloc() {
@@ -18721,8 +18803,13 @@ extension type NSSet._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSSet].
-  static bool isA(objc.ObjCObject obj) =>
-      _objc_msgSend_19nvye5(obj.ref.pointer, _sel_isKindOfClass_, _class_NSSet);
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSSet,
+        );
 
   /// alloc
   static NSSet alloc() {
@@ -18967,11 +19054,13 @@ extension type NSStream._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSStream].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSStream,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSStream,
+        );
 
   /// alloc
   static NSStream alloc() {
@@ -19366,11 +19455,13 @@ extension type NSString._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSString].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSString,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSString,
+        );
 
   /// alloc
   static NSString alloc() {
@@ -21231,11 +21322,13 @@ extension type NSTimer._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSTimer].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSTimer,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSTimer,
+        );
 
   /// alloc
   static NSTimer alloc() {
@@ -21523,8 +21616,13 @@ extension type NSURL._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSURL].
-  static bool isA(objc.ObjCObject obj) =>
-      _objc_msgSend_19nvye5(obj.ref.pointer, _sel_isKindOfClass_, _class_NSURL);
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSURL,
+        );
 
   /// URLByResolvingAliasFileAtURL:options:error:
   static NSURL? URLByResolvingAliasFileAtURL(
@@ -22567,11 +22665,13 @@ extension type NSURLHandle._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSURLHandle].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSURLHandle,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSURLHandle,
+        );
 
   /// alloc
   static NSURLHandle alloc() {
@@ -22651,11 +22751,13 @@ extension type NSValue._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [NSValue].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_NSValue,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_NSValue,
+        );
 
   /// alloc
   static NSValue alloc() {
@@ -35330,11 +35432,13 @@ extension type Protocol._(objc.ObjCObject object$) implements objc.ObjCObject {
   }
 
   /// Returns whether [obj] is an instance of [Protocol].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_Protocol,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_Protocol,
+        );
 }
 
 extension Protocol$Methods on Protocol {}
diff --git a/pkgs/objective_c/pubspec.yaml b/pkgs/objective_c/pubspec.yaml
index ca4a7fd60f..b2c36821c3 100644
--- a/pkgs/objective_c/pubspec.yaml
+++ b/pkgs/objective_c/pubspec.yaml
@@ -4,7 +4,7 @@
 
 name: objective_c
 description: 'A library to access Objective C from Flutter that acts as a support library for package:ffigen.'
-version: 9.3.0
+version: 9.4.0-wip
 repository: https://github.com/dart-lang/native/tree/main/pkgs/objective_c
 issue_tracker: https://github.com/dart-lang/native/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Aobjective_c
 
diff --git a/pkgs/swiftgen/example/avf_audio_bindings.dart b/pkgs/swiftgen/example/avf_audio_bindings.dart
index 3bd6ffa250..38d8da0335 100644
--- a/pkgs/swiftgen/example/avf_audio_bindings.dart
+++ b/pkgs/swiftgen/example/avf_audio_bindings.dart
@@ -482,11 +482,13 @@ extension type AVAudioPlayerWrapper._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [AVAudioPlayerWrapper].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_AVAudioPlayerWrapper,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_AVAudioPlayerWrapper,
+        );
 
   /// alloc
   static AVAudioPlayerWrapper alloc() {
diff --git a/pkgs/swiftgen/test/integration/callbacks_bindings.dart b/pkgs/swiftgen/test/integration/callbacks_bindings.dart
index a96f3a0d58..41222b16a9 100644
--- a/pkgs/swiftgen/test/integration/callbacks_bindings.dart
+++ b/pkgs/swiftgen/test/integration/callbacks_bindings.dart
@@ -552,11 +552,13 @@ extension type TestMessageService._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [TestMessageService].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_TestMessageService,
-  );
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_TestMessageService,
+        );
 
   /// alloc
   static TestMessageService alloc() {
diff --git a/pkgs/swiftgen/test/integration/classes_bindings.dart b/pkgs/swiftgen/test/integration/classes_bindings.dart
index 6c8f990adf..8cfcfaac81 100644
--- a/pkgs/swiftgen/test/integration/classes_bindings.dart
+++ b/pkgs/swiftgen/test/integration/classes_bindings.dart
@@ -30,11 +30,13 @@ extension type TestClassWrapper._(objc.ObjCObject object$)
   }
 
   /// Returns whether [obj] is an instance of [TestClassWrapper].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_TestClassWrapper,
-  );
+  static bool isA(objc.ObjCObject obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_TestMessageService,
+        );
 
   /// alloc
   static TestClassWrapper alloc() {
@@ -107,12 +109,14 @@ extension type TestOtherClassWrapper._(objc.ObjCObject object$)
     assert(isA(object$));
   }
 
-  /// Returns whether [obj] is an instance of [TestOtherClassWrapper].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_TestOtherClassWrapper,
-  );
+  /// Returns whether [obj] is an instance of [TestMessageService].
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_TestMessageService,
+        );
 
   /// alloc
   static TestOtherClassWrapper alloc() {
diff --git a/pkgs/swiftgen/test/integration/protocols_bindings.dart b/pkgs/swiftgen/test/integration/protocols_bindings.dart
index 66db399878..bfb64fcab0 100644
--- a/pkgs/swiftgen/test/integration/protocols_bindings.dart
+++ b/pkgs/swiftgen/test/integration/protocols_bindings.dart
@@ -350,12 +350,14 @@ extension type TestWeatherService._(objc.ObjCObject object$)
     assert(isA(object$));
   }
 
-  /// Returns whether [obj] is an instance of [TestWeatherService].
-  static bool isA(objc.ObjCObject obj) => _objc_msgSend_19nvye5(
-    obj.ref.pointer,
-    _sel_isKindOfClass_,
-    _class_TestWeatherService,
-  );
+  /// Returns whether [obj] is an instance of [TestMessageService].
+  static bool isA(objc.ObjCObject? obj) => obj == null
+      ? false
+      : _objc_msgSend_19nvye5(
+          obj.ref.pointer,
+          _sel_isKindOfClass_,
+          _class_TestMessageService,
+        );
 
   /// alloc
   static TestWeatherService alloc() {