PPS: I just had to remove the cache folder.
PPPS: Okay, its's not fixed. Removing the cache is just a workaround. Every now and then Rhythmbox crashes. If I try to play the song it crashed on again, it'll crash again. If I clear the cache I can play it and wait a while for the next crash.

I'm using #RhythmBox as my music library program on #ubuntu and a few days ago it started crashing whenever it tried to process certain music files it could play before.

So whenever those tracks come up in a playlist, or when I try to play them manually or when I try to edit them, the app crashes.
It's probably a lot of files that cause this, but I don't know which ones until I encounter them.

I've had the same issue before on Ubuntu (I think with a different music library program) until the program was completely unusable and I stopped listening to music for many years. I don't want this to happen again.

Any tips?