when i try to get onto a server it opens and then my game crashes please help

Put the summary of the bug you're having here

What I expected to happen was play online
Describe what you thought should happen here

What actually happened was the game crashed
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. go on multiplayer
3. click on a server
4. IT CRASHED