my minecraft crashes overtime i go on cosmicpvp.com on fallout planet

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
i think that you guys should fix my crash

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. ...when i go on to fallout planet my minecraft crashes
it says that i was tasseling block model
3. ...