Let me emphasize this: In my case it's not a problem with a certain model or a texture (at least I'm 99.9% sure) because I just created a new model of 3 primitives, added two skins, made a new texture and it still crashes. There is only one model/ one type of models in this project. I will now just send it to support, no matter if you want it or not.
"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual