1.9+ Crash

Put the summary of the bug you're having here

What I expected to happen was...:
I thought that I would get the new version and it to run smoothly but...

What actually happened was...:
When I tried to join a server, it crashes my minecraft!

Steps to Reproduce:
1. Change to 1.9+
2. Play minecraft and click on a server
3. BOOM! It crashes! Like there's a wall not letting me play!