This is a common crash that has occurred since at least 4.14
User Descriptions
Source Context
242 void FLevelCollection::RemoveLevel(ULevel* const Level) 243 { 244 if (Level) 245 { 246 check(Level->GetCachedLevelCollection() == this); 247 Level->SetCachedLevelCollection(nullptr); 248 ***** Levels.Remove(Level); 249 } 250 }
RESULT
Crash
Assertion failed: Level->GetCachedLevelCollection() == this [File:D:\Build\++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\Engine\Private\World.cpp] [Line: 247] UE4Editor_Engine!FLevelCollection::RemoveLevel() [world.cpp:249] UE4Editor_Engine!ULevelStreaming::SetLoadedLevel() [levelstreaming.cpp:378] UE4Editor_Engine!UWorld::UpdateLevelStreamingInner() [world.cpp:2894] UE4Editor_Engine!UWorld::UpdateLevelStreaming() [world.cpp:2918] UE4Editor_Engine!UWorld::FlushLevelStreaming() [world.cpp:2961] UE4Editor_UnrealEd!UEditorEngine::TeardownPlaySession() [playlevel.cpp:682] UE4Editor_UnrealEd!UEditorEngine::EndPlayMap() [playlevel.cpp:323] UE4Editor_UnrealEd!UEditorEngine::Tick() [editorengine.cpp:1917] UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [unrealedengine.cpp:396] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3296] UE4Editor!GuardedMain() [launch.cpp:166] UE4Editor!GuardedMainWrapper() [launchwindows.cpp:134] UE4Editor!WinMain() [launchwindows.cpp:210] UE4Editor!__scrt_common_main_seh() [exe_common.inl:253] kernel32!BaseThreadInitThunk() ntdll!RtlUserThreadStart()
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-52925 in the post.