Disconnect from server when accessing the gui of a renamed dropper. Server stays up, but client crashes. Doesn't crash in singleplayer.

Put the summary of the bug you're having here

What I expected to happen was...:
Access the GUI of a dropper

What actually happened was...:
Disconnected from server

Steps to Reproduce:
1. Rename a dropper in an anvil
2. Place dropper on ground and right click it