minecraft keeps crashing every time I try to get on creative on the server mine verse.com >:(

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
It should of let me go on to creative
What actually happened was...:
Describe what happened here
I clicked creative then i join then a second after it crashed
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...Im not sure it just always crashes
3. ...