diff --git a/pkg/dsl/lexer/lexer.go b/pkg/dsl/lexer/lexer.go
index 5a8b38fe4..055a9eed8 100644
--- a/pkg/dsl/lexer/lexer.go
+++ b/pkg/dsl/lexer/lexer.go
@@ -212,6 +212,11 @@ func (l *Lexer) lexString() string {
 		if l.ch == '\\' {
 			str += l.input[position:l.position]
 			l.readChar() // Skip the backslash
+			if l.ch == 0 {
+				// Backslash at end of input (unterminated escape); stop before
+				// position runs past the input.
+				break
+			}
 			switch l.ch {
 			case 'n':
 				str += "\n"
diff --git a/pkg/dsl/lexer/lexer_test.go b/pkg/dsl/lexer/lexer_test.go
index 969054738..8fc3ad6b6 100644
--- a/pkg/dsl/lexer/lexer_test.go
+++ b/pkg/dsl/lexer/lexer_test.go
@@ -1189,4 +1189,13 @@ rule test_rule(created_at time, started_at time) {
 		Expect(hasBoolean).Should(BeTrue())
 		Expect(hasComparison).Should(BeTrue())
 	})
+
+	It("Unterminated string ending in a backslash does not panic", func() {
+		// A quote followed by a trailing backslash reaches EOF mid-escape.
+		l := NewLexer("\"\\")
+
+		var tok token.Token
+		Expect(func() { tok = l.NextToken() }).ShouldNot(Panic())
+		Expect(tok.Type).Should(BeEquivalentTo(token.STRING))
+	})
 })