Can't play in editor on one level, others work

Hi.
In editor,
Open my “MainLevel”,
Press play,
Camera moves to player start but game does not play,
No error message.

If I open another level it works fine.

If i build i get this error but the build still suceeds
UATHelper: Packaging (Windows (64-bit)): Cook: LogScriptCore: Error: Script Msg: A null object was passed as a world context object to UEngine::GetWorldFromContextObject().
UATHelper: Packaging (Windows (64-bit)): Cook: LogScriptCore: Error: Script call stack:

Build opens and crashes instantly(default level is the previously mentioned trouble level.)

Any idea what this means?

I can probably revert version and work off an older version but preferably if this is an easy fix I would rather not have to waist the work I did on this version.

Thanks for your time in advance! It’s not the end of the world if it can’t be fixed but thanks anyway!

Extra notes: I have also tried migrating to 4.18, nothing changes.

No clue what could be but here goes some checks that might help:

-Did you set your game mode correctly for that lvl?
-Did you set your Player Pawn or Player Start correctly for that lvl?

  • When it says “A null object was passed as a world context object” seems you are trying to execute something that might be missing references. I got similar logs when I tried to build light with empty static meshes.