when i type something into the chat that isn't a command minecraft crashes

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
what i expected to happen was my text to go through the chat
What actually happened was...:
Describe what happened here
instead minecraft just crashed
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...open chat
3. ...type something thats not a command and hit enter