Description

This is a common crash that has occurred since at least 4.14.

The callstack is nearly identical to UE-48997, which appears to be fixed in 4.18; and UE-51781, which has not. The difference is that this callstack specifically references UStaticMeshThumbnailRenderer::Draw.

Users have not provided any descriptions of their actions when the crash occurred

Source Context

 1600       AWorldSettings* ULevel::GetWorldSettings(bool bChecked) const
 1601       {
 1602       	if (bChecked)
 1603       	{
 1604 ***** 		checkf( WorldSettings != nullptr, *GetPathName() );
 1605       	}
 1606       	return WorldSettings;
 1607       }
Steps to Reproduce

repro steps currently unknown

Callstack
Assertion failed: WorldSettings != nullptr [File:D:\Build\++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\Engine\Private\Level.cpp] [Line: 1605] /Engine/Transient.World_0:PersistentLevel

UE4Editor_Engine!ULevel::GetWorldSettings() [level.cpp:1605]
UE4Editor_Engine!UWorld::GetWorldSettings() [world.cpp:3917]
UE4Editor_Engine!UWorld::IsPaused() [leveltick.cpp:439]
UE4Editor_Engine!UWorld::IsCameraMoveable() [leveltick.cpp:448]
UE4Editor_Engine!FSceneViewFamily::FSceneViewFamily() [sceneview.cpp:2364]
UE4Editor_UnrealEd!UStaticMeshThumbnailRenderer::Draw() [staticmeshthumbnailrenderer.cpp:33]
UE4Editor_UnrealEd!ThumbnailTools::RenderThumbnail() [objecttools.cpp:3659]
UE4Editor_UnrealEd!FAssetThumbnailPool::Tick() [assetthumbnail.cpp:1002]
UE4Editor_UnrealEd!FTickableEditorObject::TickObjects() [tickableeditorobject.h:21]
UE4Editor_UnrealEd!UEditorEngine::Tick() [editorengine.cpp:1433]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [unrealedengine.cpp:396]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3296]
UE4Editor!GuardedMain() [launch.cpp:166]
UE4Editor!GuardedMainWrapper() [launchwindows.cpp:134]
UE4Editor!WinMain() [launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [exe_common.inl:253]
kernel32!BaseThreadInitThunk()
ntdll!RtlUserThreadStart()

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Fixed
ComponentTools
Affects Versions4.144.164.174.184.18.14.194.21
Target Fix4.22
Fix Commit4730888
Main Commit4837001
Release Commit4862694
CreatedOct 30, 2017
ResolvedJan 16, 2019
UpdatedMay 31, 2019