Unreal Engine Issues

UE-48383

[CrashReport] UE4Editor_UMG!CastChecked<UUserWidget,UObject>

[CrashReport] UE4Editor_UMG!CastChecked<UUserWidget,UObject>

Description

This is an early trending crash in the 4.17 release. This may be a regression as there is no initial evidence of this callstack occurring in 4.16.

User Descriptions

  • Just compiled my widget

Source Context

  266       /**
  267        * @return	true if this object is of the specified type.
  268        */
  269       #if UCLASS_FAST_ISA_COMPARE_WITH_OUTERWALK || UCLASS_FAST_ISA_IMPL == UCLASS_ISA_OUTERWALK
  270       	bool UObjectBaseUtility::IsA( const UClass* SomeBase ) const
  271       	{
  272       		UE_CLOG(!SomeBase, LogObj, Fatal, TEXT("IsA(NULL) cannot yield meaningful results"));
  273       
  274       		UClass* ThisClass = GetClass();
  275       
  276       		bool bOldResult = false;
  277 ***** 		for ( UClass* TempClass=ThisClass; TempClass; TempClass=TempClass->GetSuperClass() )
  278       		{
  279       			if ( TempClass == SomeBase )
  280       			{
  281       				bOldResult = true;
  282       				break;
  283       			}
  284       		}
Steps to Reproduce

repro steps currently unknown

Callstack
Access violation - code c0000005 (first/second chance not available)

UE4Editor_CoreUObject!UObjectBaseUtility::IsA() [uobjectbaseutility.cpp:278]
UE4Editor_UMG!CastChecked<UUserWidget,UObject>() [casts.h:214]
UE4Editor_UMG!UWidgetAnimation::CanPossessObject() [widgetanimation.cpp:119]
UE4Editor_Sequencer!FSequencer::GetHandleToObject() [sequencer.cpp:1999]
UE4Editor_Sequencer!FMovieSceneTrackEditor::FindOrCreateHandleToObject() [moviescenetrackeditor.cpp:93]
UE4Editor_MovieSceneTools!FKeyframeTrackEditor<UMovieScene3DTransformTrack,UMovieScene3DTransformSection,FTransformKey>::AddKeysToObjects() [keyframetrackeditor.h:95]
UE4Editor_MovieSceneTools!F3DTransformTrackEditor::OnAddTransformKeys() [transformtrackeditor.cpp:767]
UE4Editor_MovieSceneTools!TBaseRawMethodDelegateInstance<0,F3DTransformTrackEditor,FKeyPropertyResult __cdecl() [delegateinstancesimpl.h:556]
UE4Editor_Sequencer!FMovieSceneTrackEditor::AnimatablePropertyChanged() [moviescenetrackeditor.cpp:68]
UE4Editor_MovieSceneTools!F3DTransformTrackEditor::AddTransformKeys() [transformtrackeditor.cpp:758]
UE4Editor_MovieSceneTools!F3DTransformTrackEditor::OnPreTransformChanged() [transformtrackeditor.cpp:337]
UE4Editor_MovieSceneTools!TBaseRawMethodDelegateInstance<0,F3DTransformTrackEditor,void __cdecl() [delegateinstancesimpl.h:648]
UE4Editor_UnrealEd!TBaseMulticastDelegate<void,UObject & __ptr64>::Broadcast() [delegatesignatureimpl.inl:937]
UE4Editor_UnrealEd!FLevelEditorViewportClient::TrackingStarted() [leveleditorviewport.cpp:2614]
UE4Editor_UnrealEd!FMouseDeltaTracker::StartTracking() [mousedeltatracker.cpp:227]
UE4Editor_UnrealEd!FEditorViewportClient::StartTrackingDueToInput() [editorviewportclient.cpp:2559]
UE4Editor_UnrealEd!FEditorViewportClient::InputKey() [editorviewportclient.cpp:2368]
UE4Editor_UnrealEd!FLevelEditorViewportClient::InputKey() [leveleditorviewport.cpp:2518]
UE4Editor_Engine!FSceneViewport::OnMouseButtonDown() [sceneviewport.cpp:482]
UE4Editor_Slate!SViewport::OnMouseButtonDown() [sviewport.cpp:195]
UE4Editor_Slate!<lambda_7097b900f0e4be30d80fb18f98c51ea0>::operator() [slateapplication.cpp:5104]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_7097b900f0e4be30d80fb18f98c51ea0> >() [slateapplication.cpp:232]
UE4Editor_Slate!FSlateApplication::RoutePointerDownEvent() [slateapplication.cpp:5093]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonDownEvent() [slateapplication.cpp:5050]
UE4Editor_Slate!FSlateApplication::OnMouseDown() [slateapplication.cpp:4968]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1726]
UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2161]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:881]
UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:721]
user32!UserCallWinProcCheckWow()
user32!DispatchMessageWorker()
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:1009]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3151]
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
ComponentUE - Anim - Sequencer
Affects Versions4.17
Target Fix4.17.2, 4.18
Fix Commit3628046
CreatedAug 14, 2017
ResolvedSep 6, 2017
UpdatedApr 27, 2018
View Jira Issue