When you have one probe mod installed with Mutant beast installed and then kill an mutant creeper, let that spawn the egg place down then look at that entity egg then you'll crash

https://pastebin.com/raw/tqVU2nLZ

version i am on is theoneprobe-1.12-1.4.28. and MutantBeasts-1.12.2-0.6.2

Should be fixed for 0.6.3

thank you it work! <3