Description

This is a trending crash coming out of the 4.18 release. Users have not provided any descriptions of their actions when the crash occurred.

Source Context

 2014       	USkeletalMesh *ImportedSkelMesh = Cast<USkeletalMesh>(NewObject);
 2015       	//If we have import some morph target we have to rebuild the render resources since morph target are now using GPU
 2016 ***** 	if (ImportedSkelMesh->MorphTargets.Num() > 0)
 2017       	{
 2018       		ImportedSkelMesh->ReleaseResources();
 2019       		//Rebuild the resources with a post edit change since we have added some morph targets
 2020       		ImportedSkelMesh->PostEditChange();
 2021       	}
Steps to Reproduce

repro steps currently unknown

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

UE4Editor_UnrealEd!UFbxSceneImportFactory::ImportOneSkeletalMesh() [fbxsceneimportfactory.cpp:2017]
UE4Editor_UnrealEd!UFbxSceneImportFactory::ImportAllSkeletalMesh() [fbxsceneimportfactory.cpp:2050]
UE4Editor_UnrealEd!UFbxSceneImportFactory::FactoryCreateBinary() [fbxsceneimportfactory.cpp:1142]
UE4Editor_UnrealEd!UFbxSceneImportFactory::FactoryCreateBinary() [fbxsceneimportfactory.cpp:880]
UE4Editor_UnrealEd!UFbxSceneImportFactory::FactoryCreateFile() [fbxsceneimportfactory.cpp:862]
UE4Editor_UnrealEd!UFactory::ImportObject() [factory.cpp:169]
UE4Editor_AssetTools!UAssetToolsImpl::ImportAssetsInternal() [assettools.cpp:1535]
UE4Editor_AssetTools!UAssetToolsImpl::ImportAssets() [assettools.cpp:783]
UE4Editor_UnrealEd!FEditorFileUtils::Import() [filehelpers.cpp:1149]
UE4Editor_UnrealEd!FEditorFileUtils::Import() [filehelpers.cpp:1099]
UE4Editor_LevelEditor!TBaseStaticDelegateInstance<void __cdecl() [delegateinstancesimpl.h:1027]
UE4Editor_Slate!FUICommandList::ExecuteAction() [uicommandlist.cpp:97]
UE4Editor_Slate!SMenuEntryBlock::OnClicked() [smenuentryblock.cpp:1028]
UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() [smenuentryblock.cpp:988]
UE4Editor_Slate!TMemberFunctionCaller<SMenuEntryBlock,FReply() [delegateinstanceinterface.h:165]
UE4Editor_Slate!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SMenuEntryBlock,FReply() [tuple.h:497]
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl() [delegateinstancesimpl.h:327]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [delegatesignatureimpl.inl:537]
UE4Editor_Slate!SButton::OnMouseButtonUp() [sbutton.cpp:282]
UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp() [smenuentryblock.cpp:385]
UE4Editor_Slate!<lambda_1002768c627006711ef2f351a87ec0e7>::operator() [slateapplication.cpp:5263]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [slateapplication.cpp:234]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [slateapplication.cpp:5252]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [slateapplication.cpp:5750]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [slateapplication.cpp:5730]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1725]
UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2171]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:888]
UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [windowsapplication.cpp:725]
user32!UserCallWinProcCheckWow()
user32!DispatchMessageWorker()
UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [windowsplatformapplicationmisc.cpp:129]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3220]
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 Versions4.18
Target Fix4.19
Fix Commit3753440
Main Commit3807911
Release Commit3813083
CreatedNov 10, 2017
ResolvedNov 13, 2017
UpdatedFeb 4, 2019