My Minecraft keeps on crashing because of Chat box

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...: when i type in the chat and send it crashes my game and it keeps on also i get kicked for flying when im not
Describe what happened here my game keeps on crashing

Steps to Reproduce:
1. fix the codeing maybe
2. ...
3. ...