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Assertion failed: MaterialInstance

After I packaged my application and play it, sometimes crash happen... log is below.
My build configuration state is Development and I use ue4.14.3 editor built from source for my project.

[2017.07.13-06.46.22:391][381]LogThreadingWindows:Error: Runnable thread TaskGraphThreadNP 1 crashed.
[2017.07.13-06.46.22:391][381]LogWindows:Error: === Critical error: ===
[2017.07.13-06.46.22:391][381]LogWindows:Error:
[2017.07.13-06.46.22:391][381]LogWindows:Error: Assertion failed: IsInGameThread() || IsAsyncLoading() [File:D:\Source\UnrealEngine\Engine\Source\Runtime\Engine\Private\Materials\MaterialInstance.cpp] [Line: 450]

I have no idea about this. Anyone have idea?

Product Version: UE 4.14
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asked Jul 13 '17 at 08:57 AM in Using UE4

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takoji
6 2

avatar image haisong Dec 01 '17 at 04:29 AM

Did you find what is wrong? We met the same problem.

avatar image Groatse Nov 03 '18 at 11:03 PM

Latest on this? I'm having this on 4.19

avatar image Messiah_of_Savants Apr 05 '19 at 08:12 AM

Also got this error in 4.21. Added a widget component to an actor. No errors. Selected a widget for the widget component. No errors. Goto the viewport to view the widget and the editor crashes. If no widget is selected for the widget component there is no crash.

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