Description

This is a somewhat common crash in 4.17.1. This same callstack appeared a few times during 4.11, but then has not been seen until recently. Users have not provided any descriptions of their actions when the crash occurred.

The callstack shares some similarities to UE-38225, which surfaced during 4.12 and 4.13, but did not appear to occur into 4.14.

Source Context

 889       const FNameEntry* FName::GetDisplayNameEntry() const
  890       {
  891       	TNameEntryArray& Names = GetNames();
  892       	const NAME_INDEX Index = GetDisplayIndex();
  893 ***** 	return Names[Index];
  894       }
Steps to Reproduce

repro steps currently unknown

Callstack
Assertion failed: IsValidIndex(Index) [File:D:\Build\++UE4+Release-4.17+Compile\Sync\Engine\Source\Runtime\Core\Public\UObject/NameTypes.h] [Line: 356] IsValidIndex(-572662307)

UE4Editor_Core!FName::GetDisplayNameEntry() [unrealnames.cpp:894]
UE4Editor_Core!FName::ToString() [unrealnames.cpp:916]
UE4Editor_Core!FName::ToString() [unrealnames.cpp:907]
UE4Editor_CoreUObject!UObjectBaseUtility::GetName() [uobjectbaseutility.h:355]
UE4Editor_MaterialEditor!FMaterialEditor::DrawMessages() [materialeditor.cpp:1073]
UE4Editor_MaterialEditor!FMaterialEditorViewportClient::Draw() [smaterialeditorviewport.cpp:105]
UE4Editor_Engine!FViewport::Draw() [unrealclient.cpp:1198]
UE4Editor_UnrealEd!UEditorEngine::UpdateSingleViewportClient() [editorengine.cpp:2037]
UE4Editor_UnrealEd!UEditorEngine::Tick() [editorengine.cpp:1810]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [unrealedengine.cpp:402]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3215]
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 - Material Editor
Affects Versions4.114.174.184.19
Target Fix4.20
Fix Commit4112696
Main Commit4124555
Release Commit4112696
CreatedSep 14, 2017
ResolvedJun 5, 2018
UpdatedAug 21, 2018