Server crash thing

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
I right clicked with a redstone torch on this server:9.cbga.me and my game just chrashed. It said something about invalid data sent to server or from server

Steps to Reproduce:
1. Join one of the supercraftbros servers
2. Right click with redstone torch in slot 9 in the hotbar
3. Crash!