https://gist.github.com/Zsashas/d68533f64dafecdac233e6ab8cb9a0ec

Nothing in the crash points to HEE being the cause, BrassUtils is spawning invalid items when a HEE mob dies from what I can tell. Reopen if BrassUtils dev says the problem is on HEE's side, but I doubt it.

Alright, I just figured I'd post it to both mods just in case.