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

Treasure2-mc1.12.2-f14.23.5.2768-v1.10.0.jar
GottschCore-mc1.12.2-f14.23.5.2768-v1.12.1.jar

just picked up a pirates treasure chest about 1m before crash, not sure if this is the cause

Not exactly sure how this error could be caused, but fixed so it wouldn't cause an error.