crash

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
play the minecraft multiplayer server
What actually happened was...:
Describe what happened here
the screen turn whitefor a second and my minecraft launcher crash
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...join a Multiplayer server
3. ...after a few second,crashed automaticly