[r0x0r]

Problem

webview/js/state.js's Proxy set/delete traps dispatch the local change
CustomEvent before the pywebviewStateUpdate/pywebviewStateDelete bridge
call reaches Python. If a rapid set/delete race on the same state key ever
produces a stale or duplicate pywebviewStateDelete after the key was already
removed on the Python side, State.__delattr__/__delitem__ raised
AttributeError/KeyError.

js_bridge_call handled the state branches directly with no try/except
(unlike the normal js_api call path, which already has one), so the
exception propagated uncaught into the native bridge callback. On
Cocoa/PyObjC this surfaces as an uncaught ObjC exception (OC_PythonException)
that terminates the whole native process instead of just failing one call.

Fix

• webview/util.py: wrap the pywebviewStateUpdate/pywebviewStateDelete
  handling in js_bridge_call in try/except so a stale or duplicate bridge
  message is logged instead of crashing the app.
• webview/state.py: use a private _MISSING sentinel instead of None to
  represent "key not found" in _delete_state_value. This also fixes a
  related bug where deleting a key whose value is legitimately None
  incorrectly raised.

Testing

• pytest tests/test_state.py — 20 passed
• ruff check / ruff format --check — clean

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

[github-actions]

This PR has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[r0x0r]

@copilot please fix the merge conflicts in this pull request.

[Copilot]

🟢 Approval recommended

The narrow changes address the reported failures with no blocking issues identified by static review.

No open issues 🎉

What changed in this PR

This PR prevents state synchronization errors from escaping pywebview’s native bridge callbacks and fixes deletion of keys containing None.

Changes:

• Catch state bridge errors and ignore already-missing delete targets.
• Distinguish missing keys from legitimate None values using a sentinel.
• Document the fixes in the changelog.

File	Description
webview/​util.py	Contain exceptions from state bridge operations.
webview/​state.py	Use a sentinel to identify missing keys during deletion.
docs/​CHANGELOG.md	Document the state synchronization fixes.

_{Review effort: Balanced}

[Copilot]

@copilot please fix the merge conflicts in this pull request.

Resolved in 5835c7b by merging the latest master and preserving both branches’ changelog entries. The state-race fix remains intact. Tests and lint could not run because pytest and Ruff are not installed in this environment; the final review found no significant issues.