Whenever I try to join 1 server my Game crashes.

Put the summary of the bug you're having here

What I expected to happen was that I should be able to join a server and play with one of my best friends.

*What actually happened was when the server loads up, I crash

Steps to Reproduce:
1. Launch Minecraft using 1.7.9
2. Join a server called `pottercraft' the ip is pottercraft.simpleno.de
3. Your Game should crash, well mine does.