#200 crash out of 2101 in UE 5.8 on Windows
#34 crash for UE - Rendering - Architecture in UE 5.8 on Windows
#20 crash for UE - Rendering - Architecture - RHI in UE 5.8 on Windows
Assertion failed: IsInGameThread() [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\Slate\SceneViewport.cpp] [Line: 2104]
Type: Assert
User activity hint: Layout="LevelEditor" Label="DebugMap" Content=SLevelEditor
First occurrence: 2026-01-29 06:02:05
Latest occurrence: June 13, 2026 at 2:22:28 PM
Latest version: 5.8.0-53629095+++UE5+Release-5.8
Users affected: 9
Total occurrences: 9
Symbols: \\epicgames.net\root\Builds\UE5\Releases\5.8.0-53629095+++UE5+Release-5.8
UnrealEditor-Core!FDebug::CheckVerifyFailedImpl2(char const *,char const *,int,wchar_t const *,...) [Engine/Source/Runtime/Core/Private/Misc/AssertionMacros.cpp:797] UnrealEditor-Engine!FSceneViewport::UpdateViewportRHI(bool,unsigned int,unsigned int,EWindowMode::Type,EPixelFormat) [Engine/Source/Runtime/Engine/Private/Slate/SceneViewport.cpp:2104] UnrealEditor-Engine!FSceneViewport::~FSceneViewport() [Engine/Source/Runtime/Engine/Private/Slate/SceneViewport.cpp:111] UnrealEditor-Engine!0x00007ffb78ae0000 + 207c683 UnrealEditor-SlateRHIRenderer!SharedPointerInternals::TReferenceControllerBase<1>::ReleaseSharedReferenceNoInline(SharedPointerInternals::TReferenceControllerBase<1> *) [Engine/Source/Runtime/Core/Public/Templates/SharedPointerInternals.h:259] UnrealEditor-SlateRHIRenderer!FSlateRHIRenderer::DrawWindow_RenderThread(FRDGBuilder &,FSlateDrawWindowPassInputs const &) [Engine/Source/Runtime/SlateRHIRenderer/Private/SlateRHIRenderer.cpp:1237] UnrealEditor-SlateRHIRenderer!FSlateRHIRenderer::DrawWindows_RenderThread(FRHICommandListImmediate &,TArrayView<FSlateDrawWindowPassInputs const ,int>,TArrayView<FRenderThreadUpdateContext const ,int>) [Engine/Source/Runtime/SlateRHIRenderer/Private/SlateRHIRenderer.cpp:1475] UnrealEditor-SlateRHIRenderer!static void `FSlateRHIRenderer::DrawWindows_Private'::`76'::<lambda_3>::operator()(class FRHICommandListImmediate & const) [Engine/Source/Runtime/SlateRHIRenderer/Private/SlateRHIRenderer.cpp:1738] UnrealEditor-RenderCore!static void ExecuteCommand(class FRHICommandList *, const class TVariant<TUniqueFunction<void __cdecl(void)>,TUniqueFunction<void __cdecl(FRHICommandList &)>,TUniqueFunction<void __cdecl(FRHICommandListImmediate &)> > & const, const class FRenderCommandTag & const) [Engine/Source/Runtime/RenderCore/Private/RenderingThread.cpp:1531] UnrealEditor-RenderCore!static void UE::RenderCommandPipe::FCommandList::ConsumeCommands<`FRenderThreadCommandPipe::ExecuteCommands'::`2'::<lambda_1> >(const class FRenderThreadCommandPipe::ExecuteCommands::__l2::<lambda_1> & const) [Engine/Source/Runtime/RenderCore/Public/RenderingThread.h:335] UnrealEditor-RenderCore!static void `FRenderThreadCommandPipe::EnqueueAndLaunch'::`5'::<lambda_1>::operator()() [Engine/Source/Runtime/RenderCore/Private/RenderingThread.cpp:1926] UnrealEditor-RenderCore!TGraphTask<TFunctionGraphTaskImpl<void (void),1> >::ExecuteTask() [Engine/Source/Runtime/Core/Public/Async/TaskGraphInterfaces.h:703] UnrealEditor-Core!UE::Tasks::Private::FTaskBase::TryExecuteTask() [Engine/Source/Runtime/Core/Public/Tasks/TaskPrivate.h:524] UnrealEditor-Core!FNamedTaskThread::ProcessTasksNamedThread(int,bool) [Engine/Source/Runtime/Core/Private/Async/TaskGraph.cpp:807] UnrealEditor-Core!FNamedTaskThread::ProcessTasksUntilQuit(int) [Engine/Source/Runtime/Core/Private/Async/TaskGraph.cpp:696] UnrealEditor-RenderCore!RenderingThreadMain(FEvent *) [Engine/Source/Runtime/RenderCore/Private/RenderingThread.cpp:261] UnrealEditor-RenderCore!FRenderingThread::Run() [Engine/Source/Runtime/RenderCore/Private/RenderingThread.cpp:390] UnrealEditor-Core!FRunnableThreadWin::Run() [Engine/Source/Runtime/Core/Private/Windows/WindowsRunnableThread.cpp:167] UnrealEditor-Core!FRunnableThreadWin::GuardedRun() [Engine/Source/Runtime/Core/Private/Windows/WindowsRunnableThread.cpp:87] KERNEL32!0x00007ffc37410000 + 2e957 ntdll!0x00007ffc37b60000 + 427c
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-382156 in the post.
| 0 |
| Component | UE - Rendering - Architecture - RHI |
|---|---|
| Affects Versions | 5.8 |
| Target Fix | 42.00 |
| Created | May 29, 2026 |
|---|---|
| Updated | Jun 16, 2026 |