Minecraft version : 1.12.2

Defiled Lands version : 1.4.2

Crash log : https://paste.dimdev.org/duluvupoca.mccrash

Not enough info. There's no context to this crashlog.

Please include what happened before the crash and what mods interacted at this point.

The only thing I can tell is that somehow the melee attack task ran without a target, but without more context there's nothing I can do to see why that happened.