Thank you! Please let me know if it helps!
I've been thinking about this a bit, and wondering if there's maybe some kind of string encoding issue going on (I noticed you were playing in German)? Could you try playing the opening cutscene in english and seeing if that causes a crash too? Would help me narrow this down!
(There was a bug in early versions of the game that caused crashes on Linux for some people if the game tried to display any non-english characters - I was getting a few crash reports from spanish players during the same cutscene. It's been fixed for a while though, so it's probably something else - but it would set my mind at ease to know that your copy is also crashing in English!)