Every time I click on multiplayer it crashes

Put the summary of the bug you're having here

What I expected to happen was...:
I expected my mine craft to open up my multiplayer servers.
What actually happened was...:
My mine craft crashed
Describe what happened here
It crashes every time I open up my mine craft
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...Click mine craft multiplayer
3. ...