Crashes upon joining any world

Put the summary of the bug you're having here
When i attempt to join a world or sever minecraft freezes i see the brown background then it crashes

What I expected to happen was...:
Describe what you thought should happen here
to join a world

What actually happened was...:
Describe what happened here
the game froze didnt load the world and crashes

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...attempt to join any world old or new
3. ...it will crash