Issue: I thought I couldn't reproduce it, but I did, on new worldgen is when it happens, in this case I nuked my world folder, and here it fights with quite a few mods, at least this time it generated a crash report and it is the last one in the chain as for therrors.

crash report:
https://gist.github.com/acd943afab2b210b7944

fml server latest:
https://gist.github.com/ec1633e6e2a7c0bf3d93