CRASH - But only one single map, and NO error!

[Rokotain]

I can't remember ever using custom content, as I don't know where I would have gotten it from. But thanks, I will check this out as this is very weird.

[Edit:]
I went trough the ctrl+f list of all that is on the map, and nothing is "new". Like all that is on there I have either also used on another map or is just standard stuff like potplants and walls for example.

I deleted a few unecessary areas, but even then it still crashes.
Should I just delete the whole thing and make it again? I would only want if it was the last option aviable.
And if so, should I also name it something else, so the game won't think it's the same studium or something?