Typing in TextField crashes app on macOs if virtual keyboard is open while enabling

[mrudigier]

Steps to reproduce

1. On macOs, open the virtual keyboard (see attached screen shot)
2. Build the app from the attached code sample
3. Tap the "Toggle enabled" button
4. Tap into the text field
5. Type a character (with the real keyboard or the virtual one)
6. The app crashes

Some combinations of opening the keyboard later and bringing the app to the background and to the foreground again seem to avoid the bad state. But we didn't find a reproducible arrangement.

We were able to reproduce this with compiled binaries on the following systems:
Apple M1 Pro with macOs 14.4
Mac Mini X86-64 with macOs 11.7.10
Mac Mini X86-64 with macOs 10.15.7

Expected results

It is possible to enter characters into the text field while macOs the virtual keyboard is open without crashing the app

Actual results

When entering a character in the text field while using the macOs virtual keyboard, the app crashes.

Code sample

Code sample

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});
  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  bool _enabled = false;
  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: Scaffold(
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              FilledButton(
                onPressed: () {
                  setState(() {
                    _enabled = !_enabled;
                  });
                },
                child: const Text('Toggle enabled'),
              ),
              // Crashes if on-screen-keyboard is open on macOs, it was toggled to enabled and you start typing something
              TextField(
                enabled: _enabled,
              ),
            ],
          ),
        ),
      ),
    );
  }
}

Screenshots or Video

This shows the macOs virtual keyboard and the menu to open it.

Video showing the crash

TextField_enabled_bug.mov

Logs

Run console log

Launching lib/main.dart on macOS in debug mode...
Building macOS application...
--- xcodebuild: WARNING: Using the first of multiple matching destinations:
{ platform:macOS, arch:arm64, id:00006000-001A252A0C38801E, name:My Mac }
{ platform:macOS, arch:x86_64, id:00006000-001A252A0C38801E, name:My Mac }
2024-07-08 20:03:14.132 example_text_field_enabled_crash[10899:65874836] WARNING: Secure coding is automatically enabled for restorable state! However, not on all supported macOS versions of this application. Opt-in to secure coding explicitly by implementing NSApplicationDelegate.applicationSupportsSecureRestorableState:.
Debug service listening on ws://127.0.0.1:56929/GS9Ga53mcdI=/ws
Syncing files to device macOS...
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[AXPlatformNodeCocoa startEditing]: unrecognized selector sent to instance 0x6000035ea940'
*** First throw call stack:
(
	0   CoreFoundation                      0x000000019e23eccc __exceptionPreprocess + 176
	1   libobjc.A.dylib                     0x000000019dd26788 objc_exception_throw + 60
	2   CoreFoundation                      0x000000019e2f102c -[NSObject(NSObject) __retain_OA] + 0
	3   CoreFoundation                      0x000000019e1a8cdc ___forwarding___ + 1580
	4   CoreFoundation                      0x000000019e1a85f0 _CF_forwarding_prep_0 + 96
	5   FlutterMacOS                        0x0000000104299c04 _ZNK7flutter22AccessibilityBridgeMac22MacOSEventsFromAXEventEN2ui16AXEventGenerator5EventERKNS1_6AXNodeE + 1216
	6   FlutterMacOS                        0x0000000104299604 _ZN7flutter22AccessibilityBridgeMac20OnAccessibilityEventEN2ui16AXEventGenerator13TargetedEventE + 196
	7   FlutterMacOS                        0x0000000104afb24c _ZN7flutter19AccessibilityBridge13CommitUpdatesEv + 1584
	8   FlutterMacOS                        0x00000001042c7a9c -[FlutterViewController updateSemantics:] + 208
	9   FlutterMacOS                        0x00000001042ad35c _ZZ35-[FlutterEngine runWithEntrypoint:]EN3$_18__invokeEPK23FlutterSemanticsUpdate2Pv + 88
	10  FlutterMacOS                        0x0000000104b0cb60 _ZNSt3_fl10__function6__funcIZ39CreateEmbedderSemanticsUpdateCallbackV3PFvPK23FlutterSemanticsUpdate2PvES5_E3$_0NS_9allocatorIS8_EEFvNS_13unordered_mapIiN7flutter13SemanticsNodeENS_4hashIiEENS_8e	11  FlutterMacOS                        0x0000000104b1eac8 _ZN7flutter20PlatformViewEmbedder15UpdateSemanticsENSt3_fl13unordered_mapIiNS_13SemanticsNodeENS1_4hashIiEENS1_8equal_toIiEENS1_9allocatorINS1_4pairIKiS3_EEEEEENS2_IiNS_25CustomAccessibilityActio	12  FlutterMacOS                        0x0000000104a3c9cc _ZNSt3_fl10__function6__funcIZN7flutter5Shell23OnEngineUpdateSemanticsENS_13unordered_mapIiNS2_13SemanticsNodeENS_4hashIiEENS_8equal_toIiEENS_9allocatorINS_4pairIKiS5_EEEEEENS4_IiNS2_25CustomAcce	13  FlutterMacOS                        0x0000000104b1c1c8 _ZN7flutter18EmbedderTaskRunner8PostTaskEy + 652
	14  FlutterMacOS                        0x0000000104b05ea4 FlutterEngineRunTask + 36
	15  FlutterMacOS                        0x00000001042acc18 -[FlutterEngine runTaskOnEmbedder:] + 56
	16  FlutterMacOS                        0x00000001042acdcc __60-[FlutterEngine postMainThreadTask:targetTimeInNanoseconds:]_block_invoke + 64
	17  libdispatch.dylib                   0x000000019df38750 _dispatch_call_block_and_release + 32
	18  libdispatch.dylib                   0x000000019df3a3e8 _dispatch_client_callout + 20
	19  libdispatch.dylib                   0x000000019df48bb8 _dispatch_main_queue_drain + 988
	20  libdispatch.dylib                   0x000000019df487cc _dispatch_main_queue_callback_4CF + 44
	21  CoreFoundation                      0x000000019e20b4ac __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16
	22  CoreFoundation                      0x000000019e1c8c30 __CFRunLoopRun + 1996
	23  CoreFoundation                      0x000000019e1c7e0c CFRunLoopRunSpecific + 608
	24  HIToolbox                           0x00000001a8963000 RunCurrentEventLoopInMode + 292
	25  HIToolbox                           0x00000001a8962e3c ReceiveNextEventCommon + 648
	26  HIToolbox                           0x00000001a8962b94 _BlockUntilNextEventMatchingListInModeWithFilter + 76
	27  AppKit                              0x00000001a1a20970 _DPSNextEvent + 660
	28  AppKit                              0x00000001a2212dec -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 700
	29  AppKit                              0x00000001a1a13cb8 -[NSApplication run] + 476
	30  AppKit                              0x00000001a19eaf54 NSApplicationMain + 880
	31  example_text_field_enabled_crash    0x0000000100cf48e4 main + 12
	32  dyld                                0x000000019dd620e0 start + 2360
)
libc++abi: terminating due to uncaught exception of type NSException
Lost connection to device.
the Dart compiler exited unexpectedly.

Flutter Doctor output

Doctor output

[✓] Flutter (Channel stable, 3.19.4, on macOS 14.4 23E214 darwin-arm64, locale de-DE)
    • Flutter version 3.19.4 on channel stable at /Users/user/sdk/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 68bfaea224 (4 months ago), 2024-03-20 15:36:31 -0700
    • Engine revision a5c24f538d
    • Dart version 3.3.2
    • DevTools version 2.31.1

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
    • Android SDK at /Users/user/Library/Android/sdk
    • Platform android-33, build-tools 33.0.0
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.3)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 15E204a
    • CocoaPods version 1.15.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2022.3)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b829.9-10027231)

[✓] IntelliJ IDEA Community Edition (version 2023.3.3)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart

[✓] IntelliJ IDEA Community Edition (version 2021.1)
    • IntelliJ at /Applications/IntelliJ IDEA CE_x86.app
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart

[✓] VS Code (version 1.90.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension can be installed from:
      🔨 https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[✓] Connected device (2 available)
    • macOS (desktop) • macos  • darwin-arm64   • macOS 14.4 23E214 darwin-arm64
    • Chrome (web)    • chrome • web-javascript • Google Chrome 126.0.6478.127

[✓] Network resources
    • All expected network resources are available.

• No issues found!

[huycozy]

Thank you for the report. I can also reproduce the crash on my macOS machine (macOS app). I also checked this on Windows (app) and Web but the crash doesn't happen there.

flutter doctor -v (stable and master)

[✓] Flutter (Channel stable, 3.22.2, on macOS 14.1 23B74 darwin-x64, locale en-VN)
    • Flutter version 3.22.2 on channel stable at /Users/huynq/Documents/GitHub/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 761747bfc5 (3 weeks ago), 2024-06-05 22:15:13 +0200
    • Engine revision edd8546116
    • Dart version 3.4.3
    • DevTools version 2.34.3

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at /Users/huynq/Library/Android/sdk
    • Platform android-34, build-tools 34.0.0
    • ANDROID_HOME = /Users/huynq/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.10+0-17.0.10b1087.21-11572160)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.4)
    • Xcode at /Applications/Xcode15.4.app/Contents/Developer
    • Build 15F31d
    • CocoaPods version 1.15.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2023.3)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • android-studio-dir = /Applications/Android Studio.app/
    • Java version OpenJDK Runtime Environment (build 17.0.10+0-17.0.10b1087.21-11572160)

[✓] VS Code (version 1.90.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.90.0

[✓] Connected device (3 available)
    • iPhone (mobile) • d9a94afe2b649fef56ba0bfeb052f0f2a7dae95e • ios            • iOS 15.8 19H370
    • macOS (desktop) • macos                                    • darwin-x64     • macOS 14.1 23B74 darwin-x64
    • Chrome (web)    • chrome                                   • web-javascript • Google Chrome 126.0.6478.127

[✓] Network resources
    • All expected network resources are available.

• No issues found!

[!] Flutter (Channel master, 3.23.0-14.0.pre.157, on macOS 14.1 23B74 darwin-x64, locale en-VN)
    • Flutter version 3.23.0-14.0.pre.157 on channel master at /Users/huynq/Documents/GitHub/flutter_master
    ! Warning: `flutter` on your path resolves to /Users/huynq/Documents/GitHub/flutter/bin/flutter, which is not inside your current Flutter SDK checkout at /Users/huynq/Documents/GitHub/flutter_master. Consider adding /Users/huynq/Documents/GitHub/flutter_master/bin to the front of your path.
    ! Warning: `dart` on your path resolves to /Users/huynq/Documents/GitHub/flutter/bin/dart, which is not inside your current Flutter SDK checkout at /Users/huynq/Documents/GitHub/flutter_master. Consider adding /Users/huynq/Documents/GitHub/flutter_master/bin to the front of your path.
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision ad6166a8b8 (3 hours ago), 2024-07-07 19:58:25 -0400
    • Engine revision ca79a56a66
    • Dart version 3.5.0 (build 3.5.0-323.0.dev)
    • DevTools version 2.37.0
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
    • Android SDK at /Users/huynq/Library/Android/sdk
    • Platform android-34, build-tools 34.0.0
    • ANDROID_HOME = /Users/huynq/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 17.0.10+0-17.0.10b1087.21-11572160)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.4)
    • Xcode at /Applications/Xcode15.4.app/Contents/Developer
    • Build 15F31d
    • CocoaPods version 1.15.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2023.3)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • android-studio-dir = /Applications/Android Studio.app/
    • Java version OpenJDK Runtime Environment (build 17.0.10+0-17.0.10b1087.21-11572160)

[✓] VS Code (version 1.90.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.92.0

[✓] Connected device (2 available)
    • macOS (desktop) • macos  • darwin-x64     • macOS 14.1 23B74 darwin-x64
    • Chrome (web)    • chrome • web-javascript • Google Chrome 126.0.6478.127
    ! Error: iPhone has recently restarted. Xcode will continue when iPhone is unlocked. (code -14)

[✓] Network resources
    • All expected network resources are available.

! Doctor found issues in 1 category.