This is a common crash affecting users in 4.16, and has occurred since at least 4.14, affecting more than 200 unique users. Unfortunately none of them have provided any additional information.
Source Context
244 /** Find Bone Index from BoneName. Precache as much as possible in speed critical sections! */ 245 int32 FindBoneIndex(const FName& BoneName) const 246 { 247 checkSlow(FinalRefBoneInfo.Num() == FinalNameToIndexMap.Num()); 248 int32 BoneIndex = INDEX_NONE; 249 if( BoneName != NAME_None ) 250 { 251 ***** const int32* IndexPtr = FinalNameToIndexMap.Find(BoneName); 252 if( IndexPtr ) 253 { 254 BoneIndex = *IndexPtr; 255 } 256 } 257 return BoneIndex; 258 }
Result:
Editor will crash
Access violation - code c0000005 (first/second chance not available) UE4Editor_Persona!FReferenceSkeleton::FindBoneIndex() [referenceskeleton.h:252] UE4Editor_Persona!FAnimationViewportClient::DrawSockets() [animationeditorviewportclient.cpp:1415] UE4Editor_Persona!FSkeletonSelectionEditMode::Render() [skeletonselectioneditmode.cpp:315] UE4Editor_UnrealEd!FEditorModeTools::Render() [editormodemanager.cpp:837] UE4Editor_UnrealEd!FEditorViewportClient::Draw() [editorviewportclient.cpp:3527] UE4Editor_Persona!FAnimationViewportClient::Draw() [animationeditorviewportclient.cpp:367] UE4Editor_Renderer!FSceneRenderer::FSceneRenderer() [scenerendering.cpp:1196] UE4Editor_Renderer!FDeferredShadingSceneRenderer::FDeferredShadingSceneRenderer() [deferredshadingrenderer.cpp:213] UE4Editor_Renderer!FRendererModule::BeginRenderingViewFamily() [scenerendering.cpp:1974] UE4Editor_UnrealEd!FEditorViewportClient::Draw() [editorviewportclient.cpp:3399] UE4Editor_Engine!FViewport::Draw() [unrealclient.cpp:1190] UE4Editor_UnrealEd!UEditorEngine::UpdateSingleViewportClient() [editorengine.cpp:2013] UE4Editor_UnrealEd!UEditorEngine::Tick() [editorengine.cpp:1786] UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [unrealedengine.cpp:386] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3119] 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-47528 in the post.