Description

This crash was reported on the UDN. Upon further investigation it has been experienced by a handful of different users throughout 4.11 and 4.12. JIRA logged for tracking despite unknown repro steps at the time.

A similar callstack also occurred through 4.9 and 4.10: [Link Removed]

User Description(s)

  • The failure happens intermittently as users start to vertex paint selected meshes. We have yet to find a consistent repro case. Whenever the problem happens, CastChecked would fail cause the weak pointer for the selected object has become null.
  • Was going to paint verticies then it crash
Steps to Reproduce

Repro steps currently unknown. Related to Vertex Painting

Callstack
Game.log Fatal error: [File:D:\BuildAgent\work\223cc57df4eefd54\------\ue4\Engine\Source\Runtime\CoreUObject\Private\Templates\Casts.cpp] [Line: 11] Cast of nullptr to Actor failed

UE4Editor_CoreUObject!CastLogError() [casts.cpp:12]
UE4Editor_MeshPaint!CastChecked<AActor,UObject>() [casts.h:203]
UE4Editor_MeshPaint!SMeshPaint::IsPushInstanceVertexColorsToMeshButtonEnabled() [smeshpaint.cpp:2459]
UE4Editor_MeshPaint!TBaseSPMethodDelegateInstance<1,SMeshPaint,0,bool __cdecl() [delegateinstancesimpl_variadics.inl:321]
UE4Editor_SlateCore!TAttribute<bool>::Get() [attribute.h:135]
UE4Editor_SlateCore!SWidget::ShouldBeEnabled() [swidget.h:987]
UE4Editor_Slate!SButton::OnPaint() [sbutton.cpp:73]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:25]
UE4Editor_Slate!SBorder::OnPaint() [sborder.cpp:90]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SOverlay::OnPaint() [soverlay.cpp:100]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:25]
UE4Editor_Slate!SScrollBox::OnPaint() [sscrollbox.cpp:922]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:25]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:25]
UE4Editor_Slate!SBorder::OnPaint() [sborder.cpp:90]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:25]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_Slate!SBox::OnPaint() [sbox.cpp:171]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:25]
UE4Editor_Slate!SBorder::OnPaint() [sborder.cpp:90]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SOverlay::OnPaint() [soverlay.cpp:100]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:44]
UE4Editor_SlateCore!SPanel::OnPaint() [spanel.cpp:19]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [scompoundwidget.cpp:25]
UE4Editor_SlateCore!SWidget::Paint() [swidget.cpp:669]
UE4Editor_SlateCore!SPanel::PaintArrangedChildren() [spanel.cpp:44]
UE4Editor_Slate!SSplitter::OnPaint() [ssplitter.cpp:166]

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Fixed
ComponentTools
Affects Versions4.11.04.11.24.12
Target Fix4.13
Fix Commit2994537
Main Commit3050870
Release Commit3065218
CreatedMay 23, 2016
ResolvedMay 31, 2016
UpdatedMay 2, 2018
View Jira Issue