It crashes when i go to any server.

It crashes when i go to any server.
*What I expected to happen was to be able to play on server on 1.7.9 but it just always crashes when i log on to one,

*What actually happened was it crashed when i logged on to a server example the nexus

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...