Unequipping Antonian Javelin causes you player to get kicked
 

I beta buffed my Monk. When I tried to remove the Antonian Javelin in his ammo slot, my screen froze and, after a few seconds, I was kicked back to the login screen. After my character was removed the game, I logged in again and found the javelin is still equipped.

Repeated the same thing three times with identical results, so I think it's definitely the javelin causing the crash and not just a coincidence.