Hey, I found an issue which was cause by me entering the nether. I have multiple mods and the mods a run on a server. Like I said the crash happened when I first entered the nether, after that I couldn't join back the server on the same map. I started a new world and after a some time it crashed again and after trying to rejoin the server it crashed once again.

This is the first time it crashed when I entered the nether: https://pastebin.com/kYCAT7wv

This is the second crash on the new world: https://pastebin.com/cBAjXSwf

I have the same issue with a very similar log.