I cant send massages on multiplayer.

Put the summary of the bug you're having here

I just suddenly couldnt send messages and it was happening over and over again!

I was just playing like normal, at first i thought it was my laptop because its slow and really old. But it kept doing it, on one of the errors it said cause: "dinnerbone" My friends had found out about this the other day and were all playing around with it on the server, i asked them if they could remove any upside down animals. To do this i had to use "/say" because i cant send messages. i dont own the server btw! Im not actually certain this is the problem though!

Steps to Reproduce:
1. Press "t" to compose a message
2. type message...
3. Press enter and get this annoying error,