when i log into a server in 1.7 it crashes when its about to log me into it

Put the summary of the bug you're having here it wont let me log in to a server in 1.7

What I expected to happen was...:
Describe what you thought should happen here
I expected it to let me log on to a server in 1.7
What actually happened was...:
Describe what happened here
it I=didn't let me log into a server in 1.7 it just crashed
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...log in to a server in 1.7
3. ...It only does it to me though I think