everytime is try and chat minecraft launcher turns off

Put the summary of the bug you're having here

What I expected to happen was...: that i could chat on the server
Describe what you thought should happen here

What actually happened was...: eveytime i try and chat the launcher turns off
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ... press T and write a comment
3. ...click enter and launcher turns off