This is a longstanding but infrequent crash that has occurred since at least 4.16.1. Users have not provided any descriptions of their actions when the crash occurred.
The callstack closely matches to [Link Removed], but that had specific repro steps which were confirmed fixed in 4.17.
Source Context
1414 // Show Sprite Categories
1415 {
1416 // Map 'Show All' and 'Hide All' commands
1417 OutCommandList.MapAction(
1418 FLevelViewportCommands::Get().ShowAllSprites,
1419 FExecuteAction::CreateSP( this, &SLevelViewport::OnToggleAllSpriteCategories, true ) );
1420
1421 OutCommandList.MapAction(
1422 FLevelViewportCommands::Get().HideAllSprites,
1423 FExecuteAction::CreateSP( this, &SLevelViewport::OnToggleAllSpriteCategories, false ) );
1424
1425 // Bind each show flag to the same delegate. We use the delegate payload system to figure out what show flag we are dealing with
1426 for( int32 CategoryIndex = 0; CategoryIndex < GUnrealEd->SpriteIDToIndexMap.Num(); ++CategoryIndex )
1427 {
1428 ***** OutCommandList.MapAction(
1429 FLevelViewportCommands::Get().ShowSpriteCommands[ CategoryIndex ].ShowMenuItem,
1430 FExecuteAction::CreateSP( this, &SLevelViewport::ToggleSpriteCategory, CategoryIndex ),
1431 FCanExecuteAction(),
1432 FIsActionChecked::CreateSP( this, &SLevelViewport::IsSpriteCategoryVisible, CategoryIndex ) );
1433 }
1434 }
repro steps currently unknown
Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\Build\++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line: 610] Array index out of bounds: 19 from an array of size 19 UE4Editor_LevelEditor!SLevelViewport::BindShowCommands() [slevelviewport.cpp:1429] UE4Editor_LevelEditor!SLevelViewport::BindCommands() [slevelviewport.cpp:1139] UE4Editor_UnrealEd!SEditorViewport::Construct() [seditorviewport.cpp:92] UE4Editor_LevelEditor!SLevelViewport::Construct() [slevelviewport.cpp:178] UE4Editor_LevelEditor!TDecl<SLevelViewport,RequiredArgs::T0RequiredArgs>::operator<<=() [declarativesyntaxsupport.h:1091] UE4Editor_LevelEditor!FLevelViewportLayoutEntity::FLevelViewportLayoutEntity() [levelviewportlayoutentity.cpp:11] UE4Editor_LevelEditor!<lambda_e7eb8a8f5362b54fbe800efcf6558b52>::operator() [viewporttypedefinition.h:20] UE4Editor_LevelEditor!Invoke<<lambda_e7eb8a8f5362b54fbe800efcf6558b52> & __ptr64,FViewportConstructionArgs const & __ptr64>() [invoke.h:45] UE4Editor_LevelEditor!UE4Function_Private::TFunctionRefCaller<<lambda_e7eb8a8f5362b54fbe800efcf6558b52>,TSharedRef<IViewportLayoutEntity,0> __cdecl() [function.h:235] UE4Editor_LevelEditor!UE4Function_Private::TFunctionRefBase<TFunction<TSharedRef<IViewportLayoutEntity,0> __cdecl() [function.h:283] UE4Editor_LevelEditor!FLevelEditorModule::FactoryViewport() [leveleditor.cpp:560] UE4Editor_LevelEditor!FLevelViewportLayout2x2::MakeViewportLayout() [levelviewportlayout2x2.cpp:68] UE4Editor_LevelEditor!FLevelViewportLayout::BuildViewportLayout() [levelviewportlayout.cpp:193] UE4Editor_LevelEditor!FLevelViewportTabContent::UpdateViewportTabWidget() [levelviewporttabcontent.cpp:158] UE4Editor_LevelEditor!FLevelViewportTabContent::Initialize() [levelviewporttabcontent.cpp:61] UE4Editor_LevelEditor!SLevelEditor::BuildViewportTab() [sleveleditor.cpp:860] UE4Editor_LevelEditor!SLevelEditor::SpawnLevelEditorTab() [sleveleditor.cpp:578] UE4Editor_LevelEditor!TMemberFunctionCaller<SLevelEditor,TSharedRef<SDockTab,0>() [delegateinstanceinterface.h:165] UE4Editor_LevelEditor!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int,0,1>,FName,FString>::ApplyAfter<TMemberFunctionCaller<SLevelEditor,TSharedRef<SDockTab,0>() [tuple.h:422] UE4Editor_LevelEditor!TBaseSPMethodDelegateInstance<0,SLevelEditor,0,TSharedRef<SDockTab,0> __cdecl() [delegateinstancesimpl.h:327] UE4Editor_Slate!TBaseDelegate<TSharedRef<SDockTab,0>,FSpawnTabArgs const & __ptr64>::Execute() [delegatesignatureimpl.inl:537] UE4Editor_Slate!FTabManager::SpawnTab() [tabmanager.cpp:1414] UE4Editor_Slate!FTabManager::RestoreArea_Helper() [tabmanager.cpp:1273] UE4Editor_Slate!FTabManager::RestoreSplitterContent() [tabmanager.cpp:1388] UE4Editor_Slate!FTabManager::RestoreArea_Helper() [tabmanager.cpp:1366] UE4Editor_Slate!FTabManager::RestoreSplitterContent() [tabmanager.cpp:1388] UE4Editor_Slate!FTabManager::RestoreArea_Helper() [tabmanager.cpp:1366] UE4Editor_Slate!FTabManager::RestoreSplitterContent() [tabmanager.cpp:1388] UE4Editor_Slate!FTabManager::RestoreArea_Helper() [tabmanager.cpp:1366] UE4Editor_Slate!FTabManager::RestoreSplitterContent() [tabmanager.cpp:1388] UE4Editor_Slate!FTabManager::RestoreArea_Helper() [tabmanager.cpp:1357] UE4Editor_Slate!FTabManager::RestoreArea() [tabmanager.cpp:1249] UE4Editor_Slate!FTabManager::RestoreFrom() [tabmanager.cpp:808] UE4Editor_LevelEditor!SLevelEditor::RestoreContentArea() [sleveleditor.cpp:1212] UE4Editor_LevelEditor!SLevelEditor::Initialize() [sleveleditor.cpp:176] UE4Editor_LevelEditor!FLevelEditorModule::SpawnLevelEditor() [leveleditor.cpp:168] UE4Editor_LevelEditor!TMemberFunctionCaller<FLevelEditorModule,TSharedRef<SDockTab,0>() [delegateinstanceinterface.h:165] UE4Editor_LevelEditor!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<FLevelEditorModule,TSharedRef<SDockTab,0>() [tuple.h:497] UE4Editor_LevelEditor!TBaseRawMethodDelegateInstance<0,FLevelEditorModule,TSharedRef<SDockTab,0> __cdecl() [delegateinstancesimpl.h:556] UE4Editor_Slate!TBaseDelegate<TSharedRef<SDockTab,0>,FSpawnTabArgs const & __ptr64>::Execute() [delegatesignatureimpl.inl:537] UE4Editor_Slate!FTabManager::SpawnTab() [tabmanager.cpp:1414] UE4Editor_Slate!FTabManager::RestoreArea_Helper() [tabmanager.cpp:1273] UE4Editor_Slate!FTabManager::RestoreSplitterContent() [tabmanager.cpp:1388] UE4Editor_Slate!FTabManager::RestoreArea_Helper() [tabmanager.cpp:1357] UE4Editor_Slate!FTabManager::RestoreArea() [tabmanager.cpp:1249] UE4Editor_Slate!FTabManager::RestoreFrom() [tabmanager.cpp:808] UE4Editor_MainFrame!FMainFrameModule::CreateDefaultMainFrame() [mainframemodule.cpp:206] UE4Editor_UnrealEd!EditorInit() [unrealedglobals.cpp:124] UE4Editor!GuardedMain() [launch.cpp:150] 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-52290 in the post.