Crash reimporting an FBX with LODs and Morph Targets, but leaving "Import LODs" disabled

  270       * Constructor. 
  271       * Converts a skeletal mesh to raw vertex data
  272       * needed for creating a morph target mesh
  273       *
  274       * @param	SrcMesh - source skeletal mesh to convert
  275       * @param	LODIndex - level of detail to use for the geometry
  276       */
  277       FMorphMeshRawSource::FMorphMeshRawSource( USkeletalMesh* SrcMesh, int32 LODIndex ) 
  278       {
  279       	check(SrcMesh);
  280       	FSkeletalMeshResource* ImportedResource = SrcMesh->GetImportedResource();
  281       	check(ImportedResource->LODModels.IsValidIndex(LODIndex));
  282       
  283       	// get the mesh data for the given lod
  284 ***** 	FStaticLODModel& LODModel = ImportedResource->LODModels[LODIndex];
  285       
  286       	Initialize(LODModel);
  287       }
  288       
  289       FMorphMeshRawSource::FMorphMeshRawSource(FStaticLODModel& LODModel)
  290       {
  291       	Initialize(LODModel);
  292       }
  293       
  294       void FMorphMeshRawSource::Initialize(FStaticLODModel& LODModel)
  295       {
  296       	// vertices are packed to stay consistent with the indexing used by the FStaticLODModel vertex buffer
  297       	//
  298       	//	Chunk0
  299       	//		Soft0

UE4Editor_Engine!FMorphMeshRawSource::FMorphMeshRawSource() [morphtools.cpp:285]
UE4Editor_UnrealEd!UnFbx::FFbxImporter::ImportMorphTargetsInternal() [fbxskeletalmeshimport.cpp:3424]
UE4Editor_UnrealEd!UnFbx::FFbxImporter::ImportFbxMorphTarget() [fbxskeletalmeshimport.cpp:3456]
UE4Editor_UnrealEd!UnFbx::FFbxImporter::ReimportSkeletalMesh() [fbxskeletalmeshimport.cpp:1861]
UE4Editor_UnrealEd!UReimportFbxSkeletalMeshFactory::Reimport() [editorfactories.cpp:5972]
UE4Editor_UnrealEd!FReimportManager::Reimport() [editor.cpp:319]
UE4Editor_UnrealEd!FReimportManager::ReimportMultiple() [editor.cpp:504]
UE4Editor_UnrealEd!FReimportManager::ValidateAllSourceFileAndReimport() [editor.cpp:487]
UE4Editor_ContentBrowser!FAssetContextMenu::ExecuteReimport() [assetcontextmenu.cpp:1355]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,FAssetContextMenu,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:318]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,FAssetContextMenu,0,void __cdecl() [delegateinstancesimpl.h:424]
UE4Editor_Slate!SMenuEntryBlock::OnClicked() [smenuentryblock.cpp:1042]
UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() [smenuentryblock.cpp:993]
UE4Editor_Slate!TMemberFunctionCaller<SMenuEntryBlock,FReply() [delegateinstanceinterface.h:161]
UE4Editor_Slate!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SMenuEntryBlock,FReply() [tuple.h:116]
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl() [delegateinstancesimpl.h:318]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [delegatesignatureimpl.inl:522]
UE4Editor_Slate!SButton::OnMouseButtonUp() [sbutton.cpp:275]
UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp() [smenuentryblock.cpp:391]
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator() [slateapplication.cpp:5010]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() [slateapplication.cpp:215]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [slateapplication.cpp:4999]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [slateapplication.cpp:5462]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [slateapplication.cpp:5439]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1652]
UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2071]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:814]
UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:678]
user32!UserCallWinProcCheckWow()
user32!DispatchMessageWorker()
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:951]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:2811]
UE4Editor!GuardedMain() [launch.cpp:152]
UE4Editor!GuardedMainWrapper() [launchwindows.cpp:126]
UE4Editor!WinMain() [launchwindows.cpp:202]
UE4Editor!__scrt_common_main_seh() [exe_common.inl:264]
kernel32!BaseThreadInitThunk()
ntdll!RtlUserThreadStart()