Using minemenu to help me do some command lookups for minetweaker (namely /mt hand) I am getting this crash: https://gist.github.com/BevoLJ/53c8c56d149db5cb7f52

(happened on my tech pack. Here are the mods currently in use: https://github.com/BevoTechPack/BevoTechPack/blob/master/FULL/FULLmods.txt

I think this may have something to do with something that is derpy in Railcraft. A pretty major bug. Covert is working on that right now.

Not related to the command used. Something wrong with the item being used to render.

Hopefully fixed in latest commit (19efcf5)