When trading with a Piglin for the first time, you receive an achievement, and immediately crash.

Partial log

Caused by: java.lang.NullPointerException
at owmii.losttrinkets.handler.EventHandler.onLooting(EventHandler.java:139)
at net.minecraftforge.eventbus.ASMEventHandler_677_EventHandler_onLooting_LootingLevelEvent.invoke(.dynamic)