it isnt letting me play on a server in 1.7.9, it just crashes when i try to play a server or survival

Put the summary of the bug you're having here

*What I expected to happen was that it would let me play the server
Describe what you thought should happen here

*What actually happened was it crashed and wouldn't let me play on servers
Describe what happened here

Steps to Reproduce:
1. sign into minecraft 1.7.9/1.7.210
2. Connect to a server
3. Then Be annoyed because it keeps crashing