Minecraft version: 1.12.2
Wizardry version: 4.1.1
Environment: Lan Game

Issue details: Whenever someone uses transportation spell I get this crash report :

https://paste.dimdev.org/sujetehevi.mccrash

Currently it's not the biggest deal because the server itself doesn't crash thanks to vanilla fix

Please update your wizardry, that's a very old version! In this case the bug is actually still present in the newest version, but you should probably update anyway. I'll fix the bug for the next update.