minecraft crashing when joining cosmic demon planet

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...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...Join cosmicpvp.com
3. ...click on the compass and press demon planet
4. ...minecraft crashes