Posting this here to help out. Technically not an issue with the 1.12 version, but @An-Sar stated that it might have carried over from elucent's 1.11.2 version.

Log: https://paste.ee/p/cRShR

Best of luck and thanks for porting the mod.

I have this crash with the 1.12 version.

Log: https://paste.ee/p/OwOzG

I seem to have it too. I just got destroyed by a ticking entity crash also.
Heres the log it gave. I'm looking forward to getting to use this once it stops blowing up, but it seems you still have some kinks to iron out. :<

crash-2017-12-18_19.47.55-server.txt

Yeah, it is also in #14

see #14