My friend said that he clicked on a lava charm (from random things) and picked it up with his cursor, clicked on the button to switch to baubles inventory, and the server crashed.

Please provide what version of Minecraft, Forge and Baubles you are using :)

Oh, I forgot to leave the crash log http://pastebin.com/t3j0sd5m (that is from the server)

Thanks, I'll take a look

I'm unable to duplicate this problem. It does not directly seem baubles related anyway. I am testing against the 1.3 version of baubles though, so it might have fixed itself without me knowing :)

Closing this for now, but please reopen if it occurs again in the newer versions.