Description

This is a common crash affecting users in 4.16. The callstack is similar to UE-33127, which was fixed in 4.13.

User Descriptions

  • Accidentally duplicated a blueprint with multiple static mesh components in a way that, instead of copying and pasting as a new blueprint, it pasted all the static mesh components within the same blueprint actor. Tried to undo with ctrl+z and it crashed
  • pasting components into level static mesh
  • Undoing some changes in level editor
Steps to Reproduce

Copy a static mesh actor with ctrl+c
double click on a static mesh actor to select the component. (This is critical, it wont reproduce without this step)
paste
undo

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

UE4Editor_CoreUObject!FWeakObjectPtr::IsValid() [weakobjectptr.cpp:48]
UE4Editor_Engine!ULevel::MarkLevelBoundsDirty() [level.cpp:1463]
UE4Editor_Engine!AActor::PostEditUndo() [actoreditor.cpp:402]
UE4Editor_UnrealEd!FTransaction::Apply() [editortransaction.cpp:499]
UE4Editor_UnrealEd!UTransBuffer::Undo() [editortransaction.cpp:864]
UE4Editor_UnrealEd!UEditorEngine::Exec_Transaction() [editorserver.cpp:5198]
UE4Editor_UnrealEd!UEditorEngine::Exec() [editorserver.cpp:5645]
UE4Editor_UnrealEd!UUnrealEdEngine::Exec() [unrealedsrv.cpp:670]
UE4Editor_MainFrame!FMainFrameActionCallbacks::ExecuteExecCommand() [mainframeactions.cpp:969]
UE4Editor_MainFrame!TBaseStaticDelegateInstance<void __cdecl() [delegateinstancesimpl.h:1027]
UE4Editor_Slate!FUICommandList::ConditionalProcessCommandBindings() [uicommandlist.cpp:216]
UE4Editor_Slate!FUICommandList::ProcessCommandBindings() [uicommandlist.cpp:160]
UE4Editor_MainFrame!FMainFrameActionCallbacks::OnUnhandledKeyDownEvent() [mainframeactions.cpp:211]
UE4Editor_MainFrame!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<FReply() [tuple.h:497]
UE4Editor_MainFrame!TBaseStaticDelegateInstance<FReply __cdecl() [delegateinstancesimpl.h:958]
UE4Editor_Slate!TBaseDelegate<FReply,FKeyEvent const & __ptr64>::Execute() [delegatesignatureimpl.inl:537]
UE4Editor_Slate!FSlateApplication::ProcessKeyDownEvent() [slateapplication.cpp:4641]
UE4Editor_Slate!FSlateApplication::OnKeyDown() [slateapplication.cpp:4541]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1539]
UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2127]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:867]
UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:714]
user32!UserCallWinProcCheckWow()
user32!DispatchMessageWorker()
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:1009]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3058]
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
ComponentGameplay - Components
Affects Versions4.16
Target Fix4.17.2
Fix Commit3580467
CreatedJul 20, 2017
ResolvedAug 10, 2017
UpdatedAug 21, 2017