This issue occurs every time the player or an entity is slain in any shape or matter when betterHurtTimer is present. While this is not the right place to report such, I felt that I needed to post this here in order for the issue to be made notable.

this occurs on a fresh install (new config generated) and might be some sort of bad mod conflict or a degraded issue
This issue is non-existent if the optional dependency is removed

Crash Report:
https://gist.github.com/Shibva/6613d220910f9caa75929de1c043c2e8