Windows Crash

[thize]

Description

When the animation starts just crash

Source .riv/.rev file

Sent to hello@rive.app. by: gigio@blury,studio

Screenshots

Device & Versions:

Flutter 3.35.2 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 05db968908 (11 days ago) • 2025-08-25 10:21:35 -0700
Engine • hash abb725c9a5211af2a862b83f74b7eaf2652db083 (revision a8bfdfc394) (13 days ago) • 2025-08-22 23:51:12.000Z
Tools • Dart 3.9.0 • DevTools 2.48.0

Additional context

[ERROR:flutter/runtime/dart_vm_initializer.cc(40)] Unhandled Exception: 'package:flutter/src/scheduler/binding.dart': Failed assertion: line 1341 pos 12: '_schedulerPhase == SchedulerPhase.midFrameMicrotasks': is not true.
#0 _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:67:4)
#1 _AssertionError._throwNew (dart:core-patch/errors_patch.dart:49:5)
#2 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1341:12)
#3 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1200:5)
#4 _invoke (dart:ui/hooks.dart:330:13)
#5 PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:444:5)
#6 _drawFrame (dart:ui/hooks.dart:302:31)
#7 _stateMachineInstanceAdvanceAndApply.#ffiClosure138 (package:rive_native/src/ffi/rive_ffi.dart)
#8 FFIStateMachine.advanceAndApply (package:rive_native/src/ffi/rive_ffi.dart:2323:45)
#9 StateMachinePainter.advance (package:rive_native/src/rive_widget.dart:249:27)
#10 _ArtboardWidgetPainter.paint (package:rive_native/src/rive_widget.dart:439:36)
#11 _RiveNativeViewRenderObject._paintTexture (package:rive_native/src/rive_native_ffi.dart:279:35)
#12 _RiveNativeViewRenderObject.frameCallback (package:rive_native/src/rive_native_ffi.dart:265:5)
#13 Ticker._tick (package:flutter/src/scheduler/ticker.dart:269:12)
#14 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1434:15)
#15 SchedulerBinding.handleBeginFrame. (package:flutter/src/scheduler/binding.dart:1265:11)
#16 _LinkedHashMapMixin.forEach (dart:_compact_hash:764:13)
#17 SchedulerBinding.handleBeginFrame (package:flutter/src/scheduler/binding.dart:1263:17)
#18 SchedulerBinding._handleBeginFrame (package:flutter/src/scheduler/binding.dart:1179:5)
#19 _invoke1 (dart:ui/hooks.dart:346:13)
#20 PlatformDispatcher._beginFrame (dart:ui/platform_dispatcher.dart:426:5)
#21 _beginFrame (dart:ui/hooks.dart:291:31)

[HayesGordon]

Thanks for the report @thize, we'll take a look. Are you doing anything special in your code, or just running it? Which version of the package are you using?

[thize]

version: rive_native: 0.0.9

Source .riv/.rev file (mage_v2) sent to hello@rive.app. by: gigio@blury,studio

My code:
main.txt

app_native_rive_animation.txt

[BlockRen]

I also encountered the same problem. Can this be fixed as soon as possible?

[BlockRen]

When I was debugging, the crash breakpoint was at stateMachine?.advanceAndApply(dt);
And it shows: An exception has occurred. _AssertionError ('package: flutter/src/scheduler/binding.dart': assertion failed on line 1255 position 12: 'schedulerPhase == SchedulerPhase.idle': is not true.)
No matter whether I use the debug mode or the release mode, this issue will occur. Whether it is the Rive renderer or the Flutter renderer, it will occur.

[BlockRen]

Has there been any progress on this issue? This problem is obvious and will directly result in incompatibility on Windows. Once the program enters the page with Rive content, it will crash. Thank you and please do help.

[BlockRen]

Hi, @HayesGordon, I'm following up on this issue as I'm currently encountering it and it's hindering the progress of my project. I'd like to provide some additional information that might help with the investigation.
​​
Environment & Context​​
​​OS:​​ Windows 11
​​Flutter Version:​​ 3.35.5
​​Rive Packages:​​ rive: 0.14.0-dev.9, rive_native: 0.0.12
​​My Observation:​​ The crash doesn't seem to occur frequently when displaying a single .riv file, but it appears to be much more reproducible when attempting to display multiple similar files simultaneously.

​​Crash Stack Trace​​

_AssertionError._doThrowNew (d:\flutter\bin\cache\pkg\sky_engine\lib\_internal\vm\lib\errors_patch.dart:67)
_AssertionError._throwNew (d:\flutter\bin\cache\pkg\sky_engine\lib\_internal\vm\lib\errors_patch.dart:49)
SchedulerBinding.handleBeginFrame (d:\flutter\packages\flutter\lib\src\scheduler\binding.dart:1255)
SchedulerBinding._handleBeginFrame (d:\flutter\packages\flutter\lib\src\scheduler\binding.dart:1179)
_invoke1 (d:\flutter\bin\cache\pkg\sky_engine\lib\ui\hooks.dart:346)
PlatformDispatcher._beginFrame (d:\flutter\bin\cache\pkg\sky_engine\lib\ui\platform_dispatcher.dart:426)
_beginFrame (d:\flutter\bin\cache\pkg\sky_engine\lib\ui\hooks.dart:291)
FFIStateMachine.advanceAndApply (c:\Users\aaron\AppData\Local\Pub\Cache\hosted\pub.flutter-io.cn\rive_native-0.0.12\lib\src\ffi\rive_ffi.dart:2349)
MagicComponent.update (d:\Github\vita_planet\lib\game\source\magic_component.dart:100)
Ticker._tick (d:\flutter\packages\flutter\lib\src\scheduler\ticker.dart:269)
SchedulerBinding._invokeFrameCallback (d:\flutter\packages\flutter\lib\src\scheduler\binding.dart:1434)
SchedulerBinding.handleBeginFrame.<anonymous closure> (d:\flutter\packages\flutter\lib\src\scheduler\binding.dart:1265)
_LinkedHashMapMixin.forEach (d:\flutter\bin\cache\pkg\sky_engine\lib\_internal\vm_shared\lib\compact_hash.dart:764)
SchedulerBinding.handleBeginFrame (d:\flutter\packages\flutter\lib\src\scheduler\binding.dart:1263)
SchedulerBinding._handleBeginFrame (d:\flutter\packages\flutter\lib\src\scheduler\binding.dart:1179)
_invoke1 (d:\flutter\bin\cache\pkg\sky_engine\lib\ui\hooks.dart:346)
PlatformDispatcher._beginFrame (d:\flutter\bin\cache\pkg\sky_engine\lib\ui\platform_dispatcher.dart:426)
_beginFrame (d:\flutter\bin\cache\pkg\sky_engine\lib\ui\hooks.dart:291)

​​Additional Info​​
The attached a screenshot that illustrates the scenario when the crash happens.

Troubleshooting Attempts​​
I have tried several methods to resolve or work around this issue, but unfortunately, none have been successful:
Wrapping the relevant code blocks in try-catch.
Adding PostFrameCallback.
Regenerating new .riv files in the Rive editor.
The issue persists consistently, even in ​​release builds​​, where it causes a direct crash (flash exit).

This issue is currently a blocker for me. I'm happy to provide more details, run tests, or assist in any way I can. Any updates or guidance would be greatly appreciated. Thanks for your time and effort!

[HayesGordon]

@BlockRen You're hitting a Dart assertion. Could you share a reproducible sample, then we can take a look.

The screenshot you shared above does not look to be using any of our built in components/painters. Are you doing something custom?

The other issues people are seeing in this thread, are a lower level assertion in the native libraries (which doesn't seem related). Which we will investigate soon

Edit: could be related, and it's just that it's triggered through advanceAndApply

[HayesGordon]

Fix is going up for the front() called on an empty vector. And will post here when a release is out, likely only next week.

[BlockRen]

Yes, I did not use the Widget directly but employed a similar drawing approach to the Panel. This implementation works as expected on iOS, Android, and macOS. The crash occurs ​​only on Windows​​.
During debugging, the exception breakpoint triggers at the line: stateMachine?.advanceAndApply. In a release build, this manifests as a crash dialog showing the error: ​​front() called on empty vector. I suspect there might be a connection between the stateMachine operation and an internal vector being accessed while empty, specifically under Windows.
Regarding a ​​reproducible sample​​: I will try to create one. If I can successfully isolate the issue, I will share it via email.
Thanks for your time and support.

[HayesGordon]

Yes, I did not use the Widget directly but employed a similar drawing approach to the Panel. This implementation works as expected on iOS, Android, and macOS. The crash occurs ​​only on Windows​​. During debugging, the exception breakpoint triggers at the line: stateMachine?.advanceAndApply. In a release build, this manifests as a crash dialog showing the error: ​​front() called on empty vector. I suspect there might be a connection between the stateMachine operation and an internal vector being accessed while empty, specifically under Windows. Regarding a ​​reproducible sample​​: I will try to create one. If I can successfully isolate the issue, I will share it via email. Thanks for your time and support.

Not needed, I can reproduce the issue. We'll get this fixed up.

[BlockRen]

@HayesGordon, If it's helpful, I'd be more than happy to help test the fix by trying out a pre-release version. This way, I can confirm the fix works in my environment while you prepare for the official release.

[hootigger]

Any update on when the new version with this fix will be released?

[BlockRen]

@HayesGordon, Could you please share any progress or Is there a potential ​​timeline​​ for a fix version?
The application crashes unpredictably on Windows. In some cases, it crashes as soon as a page containing the Rive widget is opened. In other cases, it runs fine initially but crashes after a period of operation. This makes the feature unusable on Windows. Sorry for the rush.​