Game freezes/crashes while/after entering command(s)

Put the summary of the bug you're having here

*What I expected to happen was for the command, in this case /tp, to work, but while I was entering the command, the game just froze, then the whole game crashed. I tried multiple times but the same thing kept happening.

Steps to Reproduce:
1. First, you open up a normal world on creative mode.
2. Then you click / and type in a command targeting yourself.
3. After or while you're typing you username/email, the game should freeze/crash.