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 [Link Removed], 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 }
repro steps currently unknown
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()
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-49777 in the post.