Unreal Engine Issues and Bug Tracker (UE-41389)

Description
When a material is dragged/dropped into a skeletal editor's bone hierarchy, the editor will crash due to null ActorFactory
Regression:
Yes - Crash does not occur in 4.13.2 binary (CL 3172292)
Steps to Reproduce
Open UE4 Editor (Third Person Template)
Create new material asset
Open Content/Mannequin/Character/Mesh/UE4_MannequinSkeleton asset
Drag and release new material into bone hierarchy
Result:
Editor crashes immediately
Expected:
Material does not affect bone hierarchy, so no action occurs
Callstack
MachineId:7156C35640F86204E61B8383F45DEE17
EpicAccountId:e8c7fa630b6440f69a25a2c64d6c482c

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

UE4Editor_UnrealEd!UActorFactory::GetDefaultActorClass() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\factories\actorfactory.cpp:174]
UE4Editor_SkeletonEditor!FDisplayedAttachedAssetInfo::GenerateWidgetForNameColumn() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\skeletoneditor\private\sskeletontree.cpp:874]
UE4Editor_SkeletonEditor!SSkeletonTreeRow::GenerateWidgetForColumn() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\skeletoneditor\private\sskeletontree.cpp:192]
UE4Editor_SkeletonEditor!SMultiColumnTableRow<TSharedPtr<FDisplayedTreeRowInfo,0> >::GenerateColumns() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\public\widgets\views\stablerow.h:1069]
UE4Editor_SkeletonEditor!SMultiColumnTableRow<TSharedPtr<FDisplayedTreeRowInfo,0> >::Construct() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\public\widgets\views\stablerow.h:1034]
UE4Editor_SkeletonEditor!SSkeletonTreeRow::Construct() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\skeletoneditor\private\sskeletontree.cpp:149]
UE4Editor_SkeletonEditor!TDecl<SSkeletonTreeRow,RequiredArgs::T1RequiredArgs<TSharedRef<STableViewBase,0> const & __ptr64> >::operator<<=() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\public\widgets\declarativesyntaxsupport.h:1079]
UE4Editor_SkeletonEditor!FDisplayedAttachedAssetInfo::MakeTreeRowWidget() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\skeletoneditor\private\sskeletontree.cpp:863]
UE4Editor_SkeletonEditor!SSkeletonTree::MakeTreeRowWidget() [d:\build\++ue4+release-4.14+compile\sync\engine\source\editor\skeletoneditor\private\sskeletontree.cpp:1294]
UE4Editor_SkeletonEditor!TMemberFunctionCaller<SSkeletonTree,TSharedRef<ITableRow,0> (__cdecl SSkeletonTree::*)(TSharedPtr<FDisplayedTreeRowInfo,0>,TSharedRef<STableViewBase,0> const & __ptr64) __ptr64>::operator()<TSharedPtr<FDisplayedTreeRowInfo,0> & __ptr() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:161]
UE4Editor_SkeletonEditor!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SSkeletonTree,TSharedRef<ITableRow,0> (__cdecl SSkeletonTree::*)(TSharedPtr<FDisplayedTreeRowInfo,0>,TSharedRef<STableViewBase,0> const & __ptr64) __ptr64>() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\tuple.h:116]
UE4Editor_SkeletonEditor!TBaseSPMethodDelegateInstance<0,SSkeletonTree,0,TSharedRef<ITableRow,0> __cdecl(TSharedPtr<FDisplayedTreeRowInfo,0>,TSharedRef<STableViewBase,0> const & __ptr64)>::Execute() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:318]
UE4Editor_SkeletonEditor!TBaseDelegate<TSharedRef<ITableRow,0>,TSharedPtr<FDisplayedTreeRowInfo,0>,TSharedRef<STableViewBase,0> const & __ptr64>::Execute() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:522]
UE4Editor_SkeletonEditor!STreeView<TSharedPtr<FDisplayedTreeRowInfo,0> >::GenerateNewWidget() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\public\widgets\views\streeview.h:507]
UE4Editor_SkeletonEditor!SListView<TSharedPtr<FDisplayedTreeRowInfo,0> >::GenerateWidgetForItem() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\public\widgets\views\slistview.h:914]
UE4Editor_SkeletonEditor!SListView<TSharedPtr<FDisplayedTreeRowInfo,0> >::ReGenerateItems() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\public\widgets\views\slistview.h:824]
UE4Editor_Slate!STableViewBase::Tick() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\widgets\views\stableviewbase.cpp:237]
UE4Editor_SkeletonEditor!STreeView<TSharedPtr<FDisplayedTreeRowInfo,0> >::Tick() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\public\widgets\views\streeview.h:418]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:689]
UE4Editor_SlateCore!SOverlay::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\soverlay.cpp:100]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:25]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SOverlay::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\soverlay.cpp:100]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:25]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:25]
UE4Editor_Slate!SBorder::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\widgets\layout\sborder.cpp:86]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:25]
UE4Editor_Slate!SBorder::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\widgets\layout\sborder.cpp:86]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SOverlay::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\soverlay.cpp:100]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:25]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:44]
UE4Editor_Slate!SSplitter::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\widgets\layout\ssplitter.cpp:166]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:25]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:44]
UE4Editor_Slate!SSplitter::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\widgets\layout\ssplitter.cpp:166]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SOverlay::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\soverlay.cpp:100]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:25]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:25]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:25]
UE4Editor_Slate!SBorder::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\widgets\layout\sborder.cpp:86]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SOverlay::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\soverlay.cpp:100]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:25]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:44]
UE4Editor_Slate!SSplitter::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\widgets\layout\ssplitter.cpp:166]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SOverlay::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\soverlay.cpp:100]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:25]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SOverlay::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\soverlay.cpp:100]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\scompoundwidget.cpp:25]
UE4Editor_SlateCore!SWindow::OnPaint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swindow.cpp:1809]
UE4Editor_SlateCore!SWidget::Paint() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:692]
UE4Editor_Slate!FSlateApplication::DrawWindowAndChildren() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1127]
UE4Editor_Slate!FSlateApplication::DrawWindowAndChildren() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1216]
UE4Editor_Slate!FSlateApplication::PrivateDrawWindows() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1367]
UE4Editor_Slate!FSlateApplication::DrawWindows() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1084]
UE4Editor_Slate!FSlateApplication::TickApplication() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1689]
UE4Editor_Slate!FSlateApplication::Tick() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1481]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2894]
UE4Editor!GuardedMain() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launch.cpp:152]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\build\++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll
Community References
Crash on SSkeletonTree due to missing ActorFactory
Have Comments or More Details?

Head over to the existing Questions & Answers thread and let us know what's up.
1	Login to Vote
Fixed
Component	OLD - Anim
Affects Versions	4.14.3, 4.15
Target Fix	4.15
Fix Commit	3283184
Main Commit	3389599
Release Commit	3283184
Created	Feb 1, 2017
Resolved	Feb 2, 2017
Updated	May 18, 2020
UE-41389

Crash in Skeletal Editor due to null ActorFactory reference

Crash in Skeletal Editor due to null ActorFactory reference

Have Comments or More Details?
