Chat bug/crash on all severs and single player

Put the summary of the bug you're having here
I type a msg in chat and it disconnects me.
What I expected to happen was...:
Describe what you thought should happen here
Minecraft sends msg
What actually happened was...:
Describe what happened here
Minecraft closed and the launcher reopened
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...