Added your mod today and starting to crash none stop related to this: http://pastebin.com/Q1xppUGy

From what I can tell seems like Entity doing damage or player doing damage to a Entity it has a chance to trigger this crash.

EDIT: Happens none stop had to remove the mod sadly. Everytime our friend logins it crashes here is that crash I assume exact crash as above:
http://pastebin.com/RwBF6SDA

Can confirm this error happens on the latest version. Here's an additional log : http://pastebin.com/UrvWiKCc

Will be fixed today in the latest version