Unreal Engine Issues and Bug Tracker (UE-38779)

Description

Crash when closing the editor during Play if a web browser widget is in use. A web browser was added to the screen during Play in Editor. After this the editor is close via the [X] in the upper right corner and the editor crashes.

Steps to Reproduce

Download attached project
Open project
Open "Test" level
Play in editor
Close the editor without stopping PIE
Notice that the editor crashes

Expected: The editor would end the PIE session and close down
Result: The editor appears to crash on close

Callstack

UE4Editor_Core!rml::internal::Block::findObjectSize() 
UE4Editor_Core!FMallocTBB::Free() malloctbb.cpp:109 
UE4Editor_Core!FMemory::Free() fmemory.inl:49 
UE4Editor_SlateCore!TIndirectArray<SOverlay::FOverlaySlot,FDefaultAllocator>::DestructAndFreeItems() array.h:3476 
UE4Editor_SlateCore!SOverlay::ClearChildren() soverlay.cpp:171 
UE4Editor_Engine!UGameViewportClient::RemoveAllViewportWidgets() gameviewportclient.cpp:2036 
UE4Editor_Engine!UGameViewportClient::DetachViewportClient() gameviewportclient.cpp:237 
UE4Editor_Engine!UEngine::CleanupGameViewport() unrealengine.cpp:1778 
UE4Editor_UnrealEd!UEditorEngine::EndPlayMap() playlevel.cpp:231 
UE4Editor_UnrealEd!UEditorEngine::Tick() editorengine.cpp:1653 
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() unrealedengine.cpp:371 
UE4Editor!FEngineLoop::Tick() launchengineloop.cpp:2834 
UE4Editor!GuardedMain() launch.cpp:156 
UE4Editor!GuardedMainWrapper() launchwindows.cpp:126 
UE4Editor!WinMain() launchwindows.cpp:202 
UE4Editor!__scrt_common_main_seh() exe_common.inl:264 
kernel32!<Unknown> 
ntdll!<Unknown>

Community References

Webbrowser Widget crash

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Cannot Reproduce

Component	UE - Editor - UI Systems
Affects Versions	4.13.2

Created	Nov 17, 2016
Resolved	Dec 5, 2016
Updated	Apr 27, 2018