Suddenly quit during using UE5 project

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Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectHash.cpp] [Line: 890] Internal Error: RemoveFromClassMap NumRemoved = 0 for MaterialInstanceDynamic /Engine/Transient.MaterialInstanceDynamic_307

UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_Engine
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_LevelEditor
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_UnrealEd
UnrealEditor_LevelEditor
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_Slate
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
UnrealEditor_ApplicationCore
user32
user32
InkObj

I’ve tried reinstalling UE5 and the window system, but it doesn’t work.

Does anyone have an idea as to how this can be fixed?

Hi Sookie, Welcome to the Forums.

Generally you should never have to re-install windows to fix a UE crash!

Do you also crash with a newly created project?

“MaterialInstanceDynamic” is standing out to me, do you know if any of your Blueprints are using Dynamic Material Instances? (Usually would take the form of a ‘Create Dynamic Material Instance’ node or a “Material Instance Dynamic Object Reference” variable somewhere.

Also, try disabling Edit → Project Settings → ‘Create Garbage Collector UObject Clusters’