it crashes when i type on any server.

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
i typed it and then he raged
What actually happened was...:
Describe what happened here
i type it and i get immediately shut off, no message or anything else, my minecraft just is off.
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. type
3. done