if i try and send a chat it will shut minecraft down

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
the game will shut off if i press enter
What actually happened was...:
Describe what happened here
the game will shut off if i press enter
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...i type in a chat then
3. ...i press enter and it shuts off