[CrashReport] UE4Editor_UnrealEd!EditorLevelUtils::SetLevelVisibility() [editorlevelutils.cpp:748]

733       					if (!Level->bIsVisible)
  734       					{
  735       						Level->OwningWorld->AddToWorld(Level);
  736       					}
  737       				}
  738       				else
  739       				{
  740       					Level->OwningWorld->RemoveFromWorld(Level);
  741       				}
  742       				
  743       				// In the Editor we expect this operation will complete in a single call
  744       				check(Level->bIsVisible == bShouldBeVisible);
  745       			}
  746       
  747 ***** 			if (bShouldBeVisible && GEditor->Layers.IsValid())
  748       			{
  749       				GEditor->Layers->AddLevelLayerInformation( Level );
  750       			}
  751       
  752       			// Force the level's layers to be visible, if desired
  753       			FEditorSupportDelegates::RedrawAllViewports.Broadcast();
  754       
  755       			// Iterate over the level's actors, making a list of their layers and unhiding the layers.
  756       			TTransArray<AActor*>& Actors = Level->Actors;
  757       			for ( int32 ActorIndex = 0 ; ActorIndex < Actors.Num() ; ++ActorIndex )
  758       			{
  759       				AActor* Actor = Actors[ ActorIndex ];
  760       				if ( Actor )
  761       				{
  762       					bool bModified = false;

UE4Editor_UnrealEd!EditorLevelUtils::SetLevelVisibility() [editorlevelutils.cpp:748]
UE4Editor_WorldBrowser!FLevelModel::SetVisible() [levelmodel.cpp:221]
UE4Editor_WorldBrowser!FLevelCollectionModel::HideLevels() [levelcollectionmodel.cpp:422]
UE4Editor_WorldBrowser!SWorldHierarchyItem::OnToggleVisibility() [sworldhierarchyitem.cpp:246]
UE4Editor_WorldBrowser!TMemberFunctionCaller<SWorldHierarchyItem,FReply() [delegateinstanceinterface_variadics.h:161]
UE4Editor_WorldBrowser!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter_ExplicitReturnType<FReply,TMemberFunctionCaller<SWorldHierarchyItem,FReply() [tuple.h:128]
UE4Editor_WorldBrowser!TBaseSPMethodDelegateInstance<0,SWorldHierarchyItem,0,FReply __cdecl() [delegateinstancesimpl_variadics.inl:321]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [delegatesignatureimpl_variadics.inl:521]
UE4Editor_Slate!SButton::OnMouseButtonUp() [sbutton.cpp:275]
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator() [slateapplication.cpp:4598]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() [slateapplication.cpp:215]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [slateapplication.cpp:4587]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [slateapplication.cpp:5041]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [slateapplication.cpp:5021]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1510]
UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:1850]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:745]
UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:667]
user32!UserCallWinProcCheckWow()
user32!DispatchMessageWorker()
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:903]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:2729]
UE4Editor!GuardedMain() [launch.cpp:148]
UE4Editor!GuardedMainWrapper() [launchwindows.cpp:126]
UE4Editor!WinMain() [launchwindows.cpp:200]
UE4Editor!__scrt_common_main_seh() [exe_common.inl:264]
kernel32!BaseThreadInitThunk()
ntdll!RtlUserThreadStart()