Media scan fails

[WheelFire]

For a while now, my library scan fails after a minute. However, for as far as I can see, new media still gets added. I also have the Viperinius spotify import plugin installed which also fails after a minute. In the logs I see a few errors about trickplay (don't know how to fix them but I guess it's not that much of a problem) and an error about a path name being too long. I think that's the one causing the failing scans but I don't really know how to fix it because the "/config/data/" folder is empty (or I can't see what's inside it). 

Recent things I did that could be the source of the problem: removed a few libraries (comics, books, audiobooks & tubearchivist), maybe added a music file with some weird characters in them (just a guess)

I'm running Jellyfin with Docker compose on an Unraid server

Thanks in advance for helping out!