Editor crashed on opening level blueprint

I've been unable to reproduce this issue.
Once only occurrence so far.

I did some other things inside the level in between these steps like pressing play and copying, rotating, deleting objects in the level during this.

I think at some point I might have done a launch onto the PS4 to test the level.

1. Open a blank level in the QaGame project
2. click Window > Levels
3. In levels window, click the levels, click add existing
4. Add QA-Animation into the level Right click the QA animation map and select all the actors
5. Right click Persistent Level and click move selected actors to level.
6. Hit Yes to all for deleting the references
7. Right click the QA Animation level and click remove selected
8. Hit Yes
9. Follow the same steps above to add, move assets and remove the level but for the QA-Physics map
10. Once done click blueprints and open the level blueprint
    Result
    Editor will crash

[2017.04.10-16.33.22:715][137]LogWindows:Error: === Critical error: ===
[2017.04.10-16.33.22:715][137]LogWindows:Error:
[2017.04.10-16.33.22:715][137]LogWindows:Error: Fatal error!
[2017.04.10-16.33.22:715][137]LogWindows:Error:
[2017.04.10-16.33.22:715][137]LogWindows:Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000058
[2017.04.10-16.33.22:715][137]LogWindows:Error:
[2017.04.10-16.33.22:715][137]LogWindows:Error: UE4Editor-CoreUObject.dll!UStruct::IsChildOf() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\coreuobject\public\uobject\class.h:397]
[2017.04.10-16.33.22:716][137]LogWindows:Error: UE4Editor-BlueprintGraph.dll!FBlueprintActionInfo::GetOwnerClass() [d:\p4\dbouimad_dev-animphys\engine\source\editor\blueprintgraph\private\blueprintactionfilter.cpp:1786]
[2017.04.10-16.33.22:716][137]LogWindows:Error: UE4Editor-BlueprintGraph.dll!BlueprintActionFilterImpl::IsDeprecated() [d:\p4\dbouimad_dev-animphys\engine\source\editor\blueprintgraph\private\blueprintactionfilter.cpp:823]
[2017.04.10-16.33.22:716][137]LogWindows:Error: UE4Editor-BlueprintGraph.dll!FBlueprintActionFilter::IsFilteredByThis() [d:\p4\dbouimad_dev-animphys\engine\source\editor\blueprintgraph\private\blueprintactionfilter.cpp:2023]
[2017.04.10-16.33.22:716][137]LogWindows:Error: UE4Editor-BlueprintGraph.dll!FBlueprintActionFilter::IsFiltered() [d:\p4\dbouimad_dev-animphys\engine\source\editor\blueprintgraph\private\blueprintactionfilter.cpp:1965]
[2017.04.10-16.33.22:716][137]LogWindows:Error: UE4Editor-Kismet.dll!FBlueprintActionMenuBuilderImpl::FMenuSectionDefinition::MakeMenuItems() [d:\p4\dbouimad_dev-animphys\engine\source\editor\kismet\private\blueprintactionmenubuilder.cpp:411]
[2017.04.10-16.33.22:717][137]LogWindows:Error: UE4Editor-Kismet.dll!FBlueprintActionMenuBuilder::RebuildActionList() [d:\p4\dbouimad_dev-animphys\engine\source\editor\kismet\private\blueprintactionmenubuilder.cpp:532]
[2017.04.10-16.33.22:717][137]LogWindows:Error: UE4Editor-Kismet.dll!FBlueprintActionMenuUtils::MakePaletteMenu() [d:\p4\dbouimad_dev-animphys\engine\source\editor\kismet\private\blueprintactionmenuutils.cpp:440]
[2017.04.10-16.33.22:717][137]LogWindows:Error: UE4Editor-Kismet.dll!SBlueprintLibraryPalette::CollectAllActions() [d:\p4\dbouimad_dev-animphys\engine\source\editor\kismet\private\sblueprintlibrarypalette.cpp:232]
[2017.04.10-16.33.22:717][137]LogWindows:Error: UE4Editor-Kismet.dll!TBaseSPMethodDelegateInstance<0,SBlueprintSubPalette,0,TTypeWrapper<void> __cdecl(FGraphActionListBuilderBase & __ptr64)>::Execute() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:327]
[2017.04.10-16.33.22:718][137]LogWindows:Error: UE4Editor-Kismet.dll!TBaseSPMethodDelegateInstance<0,SBlueprintSubPalette,0,void __cdecl(FGraphActionListBuilderBase & __ptr64)>::ExecuteIfSafe() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:434]
[2017.04.10-16.33.22:718][137]LogWindows:Error: UE4Editor-GraphEditor.dll!SGraphActionMenu::RefreshAllActions() [d:\p4\dbouimad_dev-animphys\engine\source\editor\grapheditor\private\sgraphactionmenu.cpp:351]
[2017.04.10-16.33.22:718][137]LogWindows:Error: UE4Editor-GraphEditor.dll!SGraphActionMenu::Construct() [d:\p4\dbouimad_dev-animphys\engine\source\editor\grapheditor\private\sgraphactionmenu.cpp:341]
[2017.04.10-16.33.22:718][137]LogWindows:Error: UE4Editor-Kismet.dll!TDecl<SGraphActionMenu,RequiredArgs::T0RequiredArgs>::operator<<=() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\slatecore\public\widgets\declarativesyntaxsupport.h:1087]
[2017.04.10-16.33.22:719][137]LogWindows:Error: UE4Editor-Kismet.dll!SBlueprintSubPalette::Construct() [d:\p4\dbouimad_dev-animphys\engine\source\editor\kismet\private\sblueprintsubpalette.cpp:228]
[2017.04.10-16.33.22:719][137]LogWindows:Error: UE4Editor-Kismet.dll!SBlueprintLibraryPalette::Construct() [d:\p4\dbouimad_dev-animphys\engine\source\editor\kismet\private\sblueprintlibrarypalette.cpp:205]
[2017.04.10-16.33.22:719][137]LogWindows:Error: UE4Editor-Kismet.dll!TDecl<SBlueprintLibraryPalette,RequiredArgs::T1RequiredArgs<TWeakPtr<FBlueprintEditor,0> & __ptr64> >::operator<<=() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\slatecore\public\widgets\declarativesyntaxsupport.h:1087]
[2017.04.10-16.33.22:719][137]LogWindows:Error: UE4Editor-Kismet.dll!SBlueprintPalette::Construct() [d:\p4\dbouimad_dev-animphys\engine\source\editor\kismet\private\sblueprintpalette.cpp:1780]
[2017.04.10-16.33.22:719][137]LogWindows:Error: UE4Editor-Kismet.dll!TDecl<SBlueprintPalette,RequiredArgs::T1RequiredArgs<TSharedRef<FBlueprintEditor,0> && __ptr64> >::operator<<=() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\slatecore\public\widgets\declarativesyntaxsupport.h:1087]
[2017.04.10-16.33.22:720][137]LogWindows:Error: UE4Editor-Kismet.dll!FBlueprintEditor::CreateDefaultTabContents() [d:\p4\dbouimad_dev-animphys\engine\source\editor\kismet\private\blueprinteditor.cpp:2259]
[2017.04.10-16.33.22:720][137]LogWindows:Error: UE4Editor-Kismet.dll!FBlueprintEditor::CommonInitialization() [d:\p4\dbouimad_dev-animphys\engine\source\editor\kismet\private\blueprinteditor.cpp:1620]
[2017.04.10-16.33.22:720][137]LogWindows:Error: UE4Editor-Kismet.dll!FBlueprintEditor::InitBlueprintEditor() [d:\p4\dbouimad_dev-animphys\engine\source\editor\kismet\private\blueprinteditor.cpp:1734]
[2017.04.10-16.33.22:720][137]LogWindows:Error: UE4Editor-Kismet.dll!FBlueprintEditorModule::CreateBlueprintEditor() [d:\p4\dbouimad_dev-animphys\engine\source\editor\kismet\private\blueprinteditormodule.cpp:293]
[2017.04.10-16.33.22:721][137]LogWindows:Error: UE4Editor-AssetTools.dll!FAssetTypeActions_Blueprint::OpenAssetEditor() [d:\p4\dbouimad_dev-animphys\engine\source\developer\assettools\private\assettypeactions\assettypeactions_blueprint.cpp:89]
[2017.04.10-16.33.22:721][137]LogWindows:Error: UE4Editor-UnrealEd.dll!FAssetEditorManager::OpenEditorForAsset() [d:\p4\dbouimad_dev-animphys\engine\source\editor\unrealed\private\toolkits\asseteditormanager.cpp:351]
[2017.04.10-16.33.22:721][137]LogWindows:Error: UE4Editor-LevelEditor.dll!FLevelEditorActionCallbacks::OpenLevelBlueprint() [d:\p4\dbouimad_dev-animphys\engine\source\editor\leveleditor\private\leveleditoractions.cpp:2165]
[2017.04.10-16.33.22:721][137]LogWindows:Error: UE4Editor-LevelEditor.dll!TBaseStaticDelegateInstance<void __cdecl(void),TWeakPtr<SLevelEditor,0> >::ExecuteIfSafe() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:1027]
[2017.04.10-16.33.22:721][137]LogWindows:Error: UE4Editor-Slate.dll!FUICommandList::ExecuteAction() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:97]
[2017.04.10-16.33.22:722][137]LogWindows:Error: UE4Editor-Slate.dll!SMenuEntryBlock::OnClicked() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:1042]
[2017.04.10-16.33.22:722][137]LogWindows:Error: UE4Editor-Slate.dll!SMenuEntryBlock::OnMenuItemButtonClicked() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:1002]
[2017.04.10-16.33.22:722][137]LogWindows:Error: UE4Editor-Slate.dll!TMemberFunctionCaller<SMenuEntryBlock,FReply (__cdecl SMenuEntryBlock::*)(void) __ptr64>::operator()<>() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:165]
[2017.04.10-16.33.22:722][137]LogWindows:Error: UE4Editor-Slate.dll!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SMenuEntryBlock,FReply (__cdecl SMenuEntryBlock::*)(void) __ptr64> >() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\core\public\templates\tuple.h:504]
[2017.04.10-16.33.22:723][137]LogWindows:Error: UE4Editor-Slate.dll!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl(void)>::Execute() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:327]
[2017.04.10-16.33.22:723][137]LogWindows:Error: UE4Editor-Slate.dll!TBaseDelegate<FReply>::Execute() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:537]
[2017.04.10-16.33.22:723][137]LogWindows:Error: UE4Editor-Slate.dll!SButton::OnMouseButtonUp() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:278]
[2017.04.10-16.33.22:723][137]LogWindows:Error: UE4Editor-Slate.dll!SMenuEntryButton::OnMouseButtonUp() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:399]
[2017.04.10-16.33.22:724][137]LogWindows:Error: UE4Editor-Slate.dll!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator()() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5049]
[2017.04.10-16.33.22:724][137]LogWindows:Error: UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:239]
[2017.04.10-16.33.22:724][137]LogWindows:Error: UE4Editor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5038]
[2017.04.10-16.33.22:724][137]LogWindows:Error: UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5515]
[2017.04.10-16.33.22:725][137]LogWindows:Error: UE4Editor-Slate.dll!FSlateApplication::OnMouseUp() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5495]
[2017.04.10-16.33.22:725][137]LogWindows:Error: UE4Editor-Core.dll!FWindowsApplication::ProcessDeferredMessage() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\core\private\windows\windowsapplication.cpp:1704]
[2017.04.10-16.33.22:725][137]LogWindows:Error: UE4Editor-Core.dll!FWindowsApplication::DeferMessage() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\core\private\windows\windowsapplication.cpp:2127]
[2017.04.10-16.33.22:725][137]LogWindows:Error: UE4Editor-Core.dll!FWindowsApplication::ProcessMessage() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\core\private\windows\windowsapplication.cpp:867]
[2017.04.10-16.33.22:725][137]LogWindows:Error: UE4Editor-Core.dll!FWindowsApplication::AppWndProc() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\core\private\windows\windowsapplication.cpp:714]
[2017.04.10-16.33.22:726][137]LogWindows:Error: USER32.dll!0x0000000076E09BBD
[2017.04.10-16.33.22:726][137]LogWindows:Error: USER32.dll!0x0000000076E09BBD
[2017.04.10-16.33.22:726][137]LogWindows:Error: USER32.dll!0x0000000076E098C2
[2017.04.10-16.33.22:726][137]LogWindows:Error: UE4Editor-Core.dll!FWindowsPlatformMisc::PumpMessages() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:980]
[2017.04.10-16.33.22:726][137]LogWindows:Error: UE4Editor.exe!FEngineLoop::Tick() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\launch\private\launchengineloop.cpp:3033]
[2017.04.10-16.33.22:726][137]LogWindows:Error: UE4Editor.exe!GuardedMain() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\launch\private\launch.cpp:166]
[2017.04.10-16.33.22:726][137]LogWindows:Error: UE4Editor.exe!GuardedMainWrapper() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
[2017.04.10-16.33.22:726][137]LogWindows:Error: UE4Editor.exe!WinMain() [d:\p4\dbouimad_dev-animphys\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
[2017.04.10-16.33.22:727][137]LogWindows:Error: UE4Editor.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
[2017.04.10-16.33.22:727][137]LogWindows:Error: kernel32.dll!0x0000000076CE59CD
[2017.04.10-16.33.22:727][137]LogWindows:Error: ntdll.dll!0x0000000076F1A561
[2017.04.10-16.33.22:727][137]LogWindows:Error: ntdll.dll!0x0000000076F1A561
[2017.04.10-16.33.22:727][137]LogWindows:Error: