Unreal Engine Issues and Bug Tracker (UE-62352)

Description

If you have a sub level with "Initially Loaded" set to true and "Initially Visible" set to false it will crash after exiting PIE.

This issue was reported and tested in 4.20.1 (CL-4233996). It has been reproduced in Main 4.21 (CL-4234136). This is a regression from 4.19.2 (CL-4033788).

Steps to Reproduce

Open the UE4 Editor
Create a new First Person Template project
Create a new Default Level and save it
In the FirstPersonExampleMap add the created Default Level
Click on the Default Level and summon the Level Details
Check "Initially Loaded" and close the Level Details window
Play in Selected Viewport and then press ESC

Results: The Editor crashes

Expected: PIE exits successfully

Callstack

KERNELBASE.dll!UnknownFunction []
UE4Editor-ApplicationCore.dll!FWindowsErrorOutputDevice::Serialize() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowserroroutputdevice.cpp:65]
UE4Editor-Core.dll!FOutputDevice::LogfImpl() [d:\build\++ue4\sync\engine\source\runtime\core\private\misc\outputdevice.cpp:70]
UE4Editor-Core.dll!FDebug::AssertFailed() [d:\build\++ue4\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:425]
UE4Editor-Core.dll!FMsg::LogfImpl() [d:\build\++ue4\sync\engine\source\runtime\core\private\logging\logmacros.cpp:64]
UE4Editor-MessageLog.dll!FMessageLogListingModel::AddMessageInternal() [d:\build\++ue4\sync\engine\source\developer\messagelog\private\model\messageloglistingmodel.cpp:81]
UE4Editor-MessageLog.dll!FMessageLogListingViewModel::AddMessages() [d:\build\++ue4\sync\engine\source\developer\messagelog\private\presentation\messageloglistingviewmodel.cpp:156]
UE4Editor-Core.dll!FMessageLog::Flush() [d:\build\++ue4\sync\engine\source\runtime\core\private\logging\messagelog.cpp:198]
UE4Editor-Core.dll!FMessageLog::~FMessageLog() [d:\build\++ue4\sync\engine\source\runtime\core\private\logging\messagelog.cpp:95]
UE4Editor-UnrealEd.dll!UEditorEngine::EndPlayMap() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\playlevel.cpp:490]
UE4Editor-UnrealEd.dll!UEditorEngine::Tick() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\editorengine.cpp:1957]
UE4Editor-UnrealEd.dll!UUnrealEdEngine::Tick() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\unrealedengine.cpp:403]
UE4Editor.exe!FEngineLoop::Tick() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3495]
UE4Editor.exe!GuardedMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor.exe!GuardedMainWrapper() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:144]
UE4Editor.exe!WinMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:223]
UE4Editor.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:283]
KERNEL32.DLL!UnknownFunction []
ntdll.dll!UnknownFunction []

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Fixed

Component	UE - Gameplay
Affects Versions	4.20.1, 4.21
Target Fix	4.20.2

Fix Commit	4247987

Created	Jul 31, 2018
Resolved	Aug 1, 2018
Updated	Nov 9, 2018

UE-62352

When a Sublevel has "Initially Loaded" set to true and "Initially Visible" set to false, the Editor will crash after exiting PIE

When a Sublevel has "Initially Loaded" set to true and "Initially Visible" set to false, the Editor will crash after exiting PIE

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