Crash on "launch game"

Development Platform & Builds
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Fatal error: [File:D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp] [Line: 963] Attempted to create a package named 'None'

UnrealEditor_CoreUObject!CreatePackage() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:963]
...

I get this crash only when using “Launch Game” and “Play Standalone” options.

When packaging game(either dev or shipping build) I don’t get this error…what can be the source of this crash? I don’t even know where should i start searching, and this is making my debugging process much harder…

UE 5.1.1 btw

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I know this is an old post, but if you are using a map with World Partition and landscape splines, what resolved the issue for me was turning off “Is Spatially Loaded” in the details panel on the landscape spline actors in the outliner.