i try to get on another server and the game crashes

Put the summary of the bug you're having here
whenever i try to get onto another server my game crashes
What I expected to happen was...:
Describe what you thought should happen here
get to play on that server
What actually happened was...:
Describe what happened here
the game crashed
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. log into minecraft
3. multiplayer
4.pick a server
5. then it crashes