This is an infrequent crash in the 4.18 release. Users have not provided any description of their actions when the crash occurred.
Source Context
210 if (StaticMeshReferencers) 211 { 212 check(StaticMeshReferencers->Referencers.Num() > 0); 213 int32 Index = StaticMeshReferencers->Referencers.IndexOfByPredicate( 214 [=](const FStaticMeshReferencers::FReferencersInfo& Info) 215 { 216 return Info.StaticMeshComponent == this->StaticMeshComponent; 217 } 218 ); 219 check(Index != INDEX_NONE); 220 221 ***** StaticMeshComponent->BodyInstance.SetCollisionEnabled(StaticMeshReferencers->Referencers[Index].CachedCollisionType, false); 222 StaticMeshComponent->RecreatePhysicsState(); 223 224 StaticMeshReferencers->Referencers.RemoveAtSwap(Index); 225 226 // If the last reference was removed, restore the body setup for the static mesh 227 if (StaticMeshReferencers->Referencers.Num() == 0) 228 { 229 ReferencedStaticMesh->BodySetup = StaticMeshReferencers->RestoreBodySetup; 230 verify(MeshToComponentMap.Remove(ReferencedStaticMesh) == 1); 231 } 232 } 233 }
repro steps currently unknown
Assertion failed: Index != INDEX_NONE [File:D:\Build\++UE4+Release-4.18+Compile\Sync\Engine\Source\Editor\MeshPaint\Private\MeshPaintStaticMeshAdapter.cpp] [Line: 220] UE4Editor_MeshPaint!FMeshPaintGeometryAdapterForStaticMeshes::OnRemoved() [meshpaintstaticmeshadapter.cpp:222] UE4Editor_MeshPaintMode!FPaintModePainter::Refresh() [paintmodepainter.cpp:2035] UE4Editor_UnrealEd!UUnrealEdEngine::NoteSelectionChange() [editorselectutils.cpp:396] UE4Editor_UnrealEd!UUnrealEdEngine::edactDeleteSelected() [editoractor.cpp:1027] UE4Editor_UnrealEd!UEditorEngine::CopySelectedActorsToClipboard() [editorserver.cpp:3182] UE4Editor_UnrealEd!UUnrealEdEngine::Exec_Edit() [unrealedsrv.cpp:1571] UE4Editor_UnrealEd!UUnrealEdEngine::Exec() [unrealedsrv.cpp:722] UE4Editor_LevelEditor!FLevelEditorActionCallbacks::ExecuteExecCommand() [leveleditoractions.cpp:1709] UE4Editor_LevelEditor!TBaseStaticDelegateInstance<void __cdecl() [delegateinstancesimpl.h:1027] UE4Editor_Slate!FUICommandList::ExecuteAction() [uicommandlist.cpp:97] UE4Editor_Slate!SMenuEntryBlock::OnClicked() [smenuentryblock.cpp:1028] UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() [smenuentryblock.cpp:988] UE4Editor_Slate!TMemberFunctionCaller<SMenuEntryBlock,FReply() [delegateinstanceinterface.h:165] UE4Editor_Slate!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SMenuEntryBlock,FReply() [tuple.h:497] UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl() [delegateinstancesimpl.h:327] UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [delegatesignatureimpl.inl:537] UE4Editor_Slate!SButton::OnMouseButtonUp() [sbutton.cpp:282] UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp() [smenuentryblock.cpp:385] UE4Editor_Slate!<lambda_1002768c627006711ef2f351a87ec0e7>::operator() [slateapplication.cpp:5263] UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [slateapplication.cpp:234] UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [slateapplication.cpp:5252] UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [slateapplication.cpp:5750] UE4Editor_Slate!FSlateApplication::OnMouseUp() [slateapplication.cpp:5730] UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1725] UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2171] UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:888] UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [windowsapplication.cpp:725] user32!UserCallWinProcCheckWow() user32!DispatchMessageWorker() UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [windowsplatformapplicationmisc.cpp:129] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3220] 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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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-52618 in the post.