Server: CatServer-237b0d4-universal.jar

Crash:
crash-2020-09-04_23.25.52-server.txt

Are you able to reproduce this crash?

Yeah
Do you need the log?

latest.log

(Had a lot of stuff to deal with lately, wasn't able to sit down and answer these right away)
I probably need to move the particle spawning into a separate handler that's registered client side only, if I had to guess.

I'll try this and see if I can get this tested on a server to verify it works. I assume this crash happens on server startup, before anyone can even join the server?

Also thanks @James103 for helping out here.

Yeah
I can't open server if I install the mod.

Well I definitely messed something up here pretty badly then. Will try to fix ASAP.