not sure if this crash has already been reported but some one on my server was in a crash loop and it looks like it has to do with this mod heres the crash report http://pastebin.com/d8CcG2hN

running
TombManyGraves-1.11.2-3.0.0
Forge 2255
minecraft 1.11.2

This issue is for a different version of the mod. I've opened the issue on the appropriate page.