I don’t know why but keep crashing to me at start the editor in 4.15 
"Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line: 633]
Array index out of bounds: 4 from an array of size 1
UE4Editor_Core!FDebug::AssertFailed() [engine\source\runtime\core\private\misc\assertionmacros.cpp:349]
UE4Editor_LevelEditor!SLevelEditor::RefreshEditorModeCommands() \engine\source\editor\leveleditor\private\sleveleditor.cpp:1320]
UE4Editor_LevelEditor!SLevelEditor::RestoreContentArea() \engine\source\editor\leveleditor\private\sleveleditor.cpp:1120]
UE4Editor_LevelEditor!SLevelEditor::Initialize() \engine\source\editor\leveleditor\private\sleveleditor.cpp:176]
UE4Editor_LevelEditor!FLevelEditorModule::SpawnLevelEditor() \engine\source\editor\leveleditor\private\leveleditor.cpp:169]
UE4Editor_LevelEditor!TMemberFunctionCaller<FLevelEditorModule,TSharedRef<SDockTab,0> (__cdecl FLevelEditorModule::)(FSpawnTabArgs const & __ptr64) __ptr64>::operator()<FSpawnTabArgs const & __ptr64>() \engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:165]
UE4Editor_LevelEditor!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<FLevelEditorModule,TSharedRef<SDockTab,0> (__cdecl FLevelEditorModule::)(FSpawnTabArgs const & __ptr64) __ptr64>,FSpawnTabArgs const & __ptr64>() \engine\source\runtime\core\public\delegates uple.h:134]
UE4Editor_LevelEditor!TBaseRawMethodDelegateInstance<0,FLevelEditorModule,TSharedRef<SDockTab,0> __cdecl(FSpawnTabArgs const & __ptr64)>::Execute() \engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:556]
UE4Editor_Slate!TBaseDelegate<TSharedRef<SDockTab,0>,FSpawnTabArgs const & __ptr64>::Execute() \engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:537]
UE4Editor_Slate!FTabManager::SpawnTab() \engine\source\runtime\slate\private\framework\docking abmanager.cpp:1413]
UE4Editor_Slate!FTabManager::RestoreArea_Helper() \engine\source\runtime\slate\private\framework\docking abmanager.cpp:1272]
UE4Editor_Slate!FTabManager::RestoreSplitterContent() \engine\source\runtime\slate\private\framework\docking abmanager.cpp:1387]
UE4Editor_Slate!FTabManager::RestoreArea_Helper() \engine\source\runtime\slate\private\framework\docking abmanager.cpp:1356]
UE4Editor_Slate!FTabManager::RestoreArea() \engine\source\runtime\slate\private\framework\docking abmanager.cpp:1248]
UE4Editor_Slate!FTabManager::RestoreFrom() \engine\source\runtime\slate\private\framework\docking abmanager.cpp:806]
UE4Editor_MainFrame!FMainFrameModule::CreateDefaultMainFrame() \engine\source\editor\mainframe\private\mainframemodule.cpp:209]
UE4Editor_UnrealEd!EditorInit() \engine\source\editor\unrealed\private\unrealedglobals.cpp:124]
UE4Editor!GuardedMain() \engine\source\runtime\launch\private\launch.cpp:150]
UE4Editor!GuardedMainWrapper() \engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor!WinMain() \engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]"
In a random way some times spawn under the ground the meshes or atleast spawn not from the origin, testing in the vehicle map and some spawn some cm in the bottom and others in the top normal way.
*Looks like the error only happen with my project in a fresh project work fine, no idea why, fails at add to the tabs the controls I think…