Description

The editor is crashing after closing the TM_Landscape level

This is a regression from 4.15.2

Steps to Reproduce
  1. Open QAGame in the editor
  2. Open TM_Landscape
  3. Select File -> New Level
  4. Select Default level

Result: Editor crashes

Callstack
Access violation - code c0000005 (first/second chance not available)

UE4Editor_Foliage!FMulticastDelegateBase<FWeakObjectPtr>::RemoveAll() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\delegates\multicastdelegatebase.h:81]
UE4Editor_Foliage!FFoliageMeshInfo::~FFoliageMeshInfo() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\foliage\private\instancedfoliage.cpp:677]
UE4Editor_Foliage!TSparseArray<TSetElement<TTuple<UFoliageType * __ptr64,TUniqueObj<FFoliageMeshInfo> > >,TSparseArrayAllocator<FDefaultAllocator,FDefaultBitArrayAllocator> >::Empty() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\containers\sparsearray.h:232]
UE4Editor_Foliage!AInstancedFoliageActor::~AInstancedFoliageActor()
UE4Editor_Foliage!AInstancedFoliageActor::`scalar deleting destructor'()
UE4Editor_CoreUObject!IncrementalPurgeGarbage() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\garbagecollection.cpp:1222]
UE4Editor_CoreUObject!CollectGarbageInternal() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\garbagecollection.cpp:1630]
UE4Editor_CoreUObject!CollectGarbage() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\coreuobject\private\uobject\garbagecollection.cpp:1654]
UE4Editor_UnrealEd!UEditorEngine::Cleanse() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:2186]
UE4Editor_UnrealEd!UEditorEngine::EditorDestroyWorld() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\editorserver.cpp:2096]
UE4Editor_UnrealEd!UEditorEngine::Map_Load() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\editorserver.cpp:2455]
UE4Editor_UnrealEd!UEditorEngine::HandleMapCommand() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\editorserver.cpp:6121]
UE4Editor_UnrealEd!UEditorEngine::Exec() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\editorserver.cpp:5598]
UE4Editor_UnrealEd!UUnrealEdEngine::Exec() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\unrealedsrv.cpp:670]
UE4Editor_UnrealEd!FEditorFileUtils::LoadMap() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\unrealed\private\filehelpers.cpp:2259]
UE4Editor_LevelEditor!FLevelEditorActionCallbacks::NewLevel() [d:\build\++ue4+release-4.16+compile\sync\engine\source\editor\leveleditor\private\leveleditoractions.cpp:217]
UE4Editor_LevelEditor!TBaseStaticDelegateInstance<void __cdecl(void)>::ExecuteIfSafe() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:1027]
UE4Editor_Slate!FUICommandList::ExecuteAction() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:97]
UE4Editor_Slate!SMenuEntryBlock::OnClicked() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:1042]
UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:1002]
UE4Editor_Slate!TMemberFunctionCaller<SMenuEntryBlock,FReply (__cdecl SMenuEntryBlock::*)(void) __ptr64>::operator()<>() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:165]
UE4Editor_Slate!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SMenuEntryBlock,FReply (__cdecl SMenuEntryBlock::*)(void) __ptr64> >() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\templates\tuple.h:497]
UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SMenuEntryBlock,0,FReply __cdecl(void)>::Execute() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:327]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:537]
UE4Editor_Slate!SButton::OnMouseButtonUp() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:278]
UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\multibox\smenuentryblock.cpp:399]
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator()() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5049]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:239]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5038]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5515]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5495]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:1704]
UE4Editor_Core!FWindowsApplication::DeferMessage() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:2127]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:867]
UE4Editor_Core!FWindowsApplication::AppWndProc() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:714]
user32
user32
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:980]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3056]
UE4Editor!GuardedMain() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor!WinMain() [d:\build\++ue4+release-4.16+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll

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Fixed
ComponentTools - Foliage
Affects Versions4.16
Target Fix4.16
Fix Commit3398084
Main Commit3427032
Release Commit3398084
CreatedApr 18, 2017
ResolvedApr 18, 2017
UpdatedMay 6, 2017