Type 'Null' is not a subtype of type 'RenderBox' in type cast.

[jitender-skycap]

I had developed an app and use firebase crashlytics to that and logged with occurrence of crash.

      Fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError: type 'Null' is not a subtype of type 'RenderBox' in type cast. Error thrown .
   at BaseTouchRippleGestureRecognizer._renderBox(base_recognizer.dart:40)
   at BaseTouchRippleGestureRecognizer.handleEvent(base_recognizer.dart:65)
   at PointerRouter._dispatch(pointer_router.dart:98)
   at PointerRouter._dispatchEventToRoutes.<fn>(pointer_router.dart:143)
   at _LinkedHashMapMixin.forEach(dart:collection)
   at PointerRouter._dispatchEventToRoutes(pointer_router.dart:141)
   at PointerRouter.route(pointer_router.dart:127)
   at GestureBinding.handleEvent(binding.dart:501)
   at GestureBinding.dispatchEvent(binding.dart:481)
   at RendererBinding.dispatchEvent(binding.dart:450)
   at GestureBinding._handlePointerEventImmediately(binding.dart:426)
   at GestureBinding.handlePointerEvent(binding.dart:389)
   at GestureBinding._flushPointerEventQueue(binding.dart:336)
   at GestureBinding._handlePointerDataPacket(binding.dart:305)

   when I tried to figure it locally no crash was found, any help.??

   Note:- I was using its 1.1.21 version, and now I update to latest on ie 2.2.1. Will this help in reducing crash??

[MTtankkeo]

Thanks for reporting this issue. It seems that the RenderBox being null is an extremely rare situation, which is why there is no exception handling for it. Even in the latest version, this issue could still occur, so it’s important to address it. However, it would be greatly helpful if you could provide an example code where this exception happens for more accurate testing. 😀

[MTtankkeo]

Try updating to version 2.2.2 to see if the issue is resolved. (Since the structure differs from version 1.0, you may need to modify your existing code.)

[jitender-skycap]

Try updating to version 2.2.2 to see if the issue is resolved. (Since the structure differs from version 1.0, you may need to modify your existing code.)

@MTtankkeo , thanks for update, I had updated the version. Lets see after release.

[jitender-skycap]

Thanks for reporting this issue. It seems that the RenderBox being null is an extremely rare situation, which is why there is no exception handling for it. Even in the latest version, this issue could still occur, so it’s important to address it. However, it would be greatly helpful if you could provide an example code where this exception happens for more accurate testing. 😀

@MTtankkeo , Actually this happen for iOS user only(not for android) in live app, I'm not able to reproduce it in debug mode, so can't explain much about the code.

[jitender-skycap]

@MTtankkeo, I got one more crash related to this, on android device. Even this is related to other dependency (animated_list_plus) but, it might be helpful in providing you more detail.

Fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError: Null check operator used on a null value. Error thrown . at AnimationController.stop(animation_controller.dart:853) at AnimationController._animateToInternal(animation_controller.dart:677) at AnimationController.reverse(animation_controller.dart:537) at TouchRippleSpreadingEffect.cancel(touch_ripple_effect.dart:142) at TouchRippleSpreadingEffect.onRejected(touch_ripple_effect.dart:161) at _TouchRippleGestureDetectorState.initBuilders..(touch_ripple_gesture_detector.dart:235) at TouchRippleTapGestureRecognizer.rejectGesture(touch_ripple_gesture_recognizer.dart:296) at GestureArenaManager._resolve(arena.dart:240) at GestureArenaEntry.resolve(arena.dart:55) at OneSequenceGestureRecognizer.resolve(recognizer.dart:451) at TouchRippleGestureRecognizer.reject(touch_ripple_gesture_recognizer.dart:114) at TouchRippleGestureRecognizer.handleEvent(touch_ripple_gesture_recognizer.dart:93) at PointerRouter._dispatch(pointer_router.dart:98) at PointerRouter._dispatchEventToRoutes.(pointer_router.dart:143) at _LinkedHashMapMixin.forEach(dart:collection) at PointerRouter._dispatchEventToRoutes(pointer_router.dart:141) at PointerRouter.route(pointer_router.dart:127) at GestureBinding.handleEvent(binding.dart:501) at GestureBinding.dispatchEvent(binding.dart:481) at RendererBinding.dispatchEvent(binding.dart:450) at GestureBinding._handlePointerEventImmediately(binding.dart:426) at GestureBinding.handlePointerEvent(binding.dart:389) at GestureBinding._flushPointerEventQueue(binding.dart:336) at GestureBinding._handlePointerDataPacket(binding.dart:305)

[MTtankkeo]

Thanks, It appears that the related reorderable list package may be dynamically moving items or changing widget tree positions, which is causing unexpected exceptions related to the AnimationController. I believe I can address this by implementing additional exception handling to resolve the issue.

i will soon release version 2.2.3 with a fix or improvement for this issue.

[MTtankkeo]

@MTtankkeo, I got one more crash related to this, on android device. Even this is related to other dependency (animated_list_plus) but, it might be helpful in providing you more detail.

Fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError: Null check operator used on a null value. Error thrown . at AnimationController.stop(animation_controller.dart:853) at AnimationController._animateToInternal(animation_controller.dart:677) at AnimationController.reverse(animation_controller.dart:537) at TouchRippleSpreadingEffect.cancel(touch_ripple_effect.dart:142) at TouchRippleSpreadingEffect.onRejected(touch_ripple_effect.dart:161) at _TouchRippleGestureDetectorState.initBuilders..(touch_ripple_gesture_detector.dart:235) at TouchRippleTapGestureRecognizer.rejectGesture(touch_ripple_gesture_recognizer.dart:296) at GestureArenaManager._resolve(arena.dart:240) at GestureArenaEntry.resolve(arena.dart:55) at OneSequenceGestureRecognizer.resolve(recognizer.dart:451) at TouchRippleGestureRecognizer.reject(touch_ripple_gesture_recognizer.dart:114) at TouchRippleGestureRecognizer.handleEvent(touch_ripple_gesture_recognizer.dart:93) at PointerRouter._dispatch(pointer_router.dart:98) at PointerRouter._dispatchEventToRoutes.(pointer_router.dart:143) at _LinkedHashMapMixin.forEach(dart:collection) at PointerRouter._dispatchEventToRoutes(pointer_router.dart:141) at PointerRouter.route(pointer_router.dart:127) at GestureBinding.handleEvent(binding.dart:501) at GestureBinding.dispatchEvent(binding.dart:481) at RendererBinding.dispatchEvent(binding.dart:450) at GestureBinding._handlePointerEventImmediately(binding.dart:426) at GestureBinding.handlePointerEvent(binding.dart:389) at GestureBinding._flushPointerEventQueue(binding.dart:336) at GestureBinding._handlePointerDataPacket(binding.dart:305)

@jitender-skycap A version 2.2.3 has been released to address this issue. Please update to the latest version and check if the exception still occurs.

[jitender-skycap]

@MTtankkeo, I got one more crash related to this, on android device. Even this is related to other dependency (animated_list_plus) but, it might be helpful in providing you more detail. Fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError: Null check operator used on a null value. Error thrown . at AnimationController.stop(animation_controller.dart:853) at AnimationController._animateToInternal(animation_controller.dart:677) at AnimationController.reverse(animation_controller.dart:537) at TouchRippleSpreadingEffect.cancel(touch_ripple_effect.dart:142) at TouchRippleSpreadingEffect.onRejected(touch_ripple_effect.dart:161) at _TouchRippleGestureDetectorState.initBuilders..(touch_ripple_gesture_detector.dart:235) at TouchRippleTapGestureRecognizer.rejectGesture(touch_ripple_gesture_recognizer.dart:296) at GestureArenaManager._resolve(arena.dart:240) at GestureArenaEntry.resolve(arena.dart:55) at OneSequenceGestureRecognizer.resolve(recognizer.dart:451) at TouchRippleGestureRecognizer.reject(touch_ripple_gesture_recognizer.dart:114) at TouchRippleGestureRecognizer.handleEvent(touch_ripple_gesture_recognizer.dart:93) at PointerRouter._dispatch(pointer_router.dart:98) at PointerRouter._dispatchEventToRoutes.(pointer_router.dart:143) at _LinkedHashMapMixin.forEach(dart:collection) at PointerRouter._dispatchEventToRoutes(pointer_router.dart:141) at PointerRouter.route(pointer_router.dart:127) at GestureBinding.handleEvent(binding.dart:501) at GestureBinding.dispatchEvent(binding.dart:481) at RendererBinding.dispatchEvent(binding.dart:450) at GestureBinding._handlePointerEventImmediately(binding.dart:426) at GestureBinding.handlePointerEvent(binding.dart:389) at GestureBinding._flushPointerEventQueue(binding.dart:336) at GestureBinding._handlePointerDataPacket(binding.dart:305)

@jitender-skycap A version 2.2.3 has been released to address this issue. Please update to the latest version and check if the exception still occurs.

Thanks, @MTtankkeo , will update the sdk and update you after releasing new app version.