my minecraft crashes overtime i go on cosmicpvp.com on fallout planet it says I'm tesseling block model.

Put the summary of the bug you're having here

What I expected to happen was...:
i know i know that this is 1.8.9 but cosmicpvp is only 1.9-1.8.9
but plz help me

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 fallout planet my game freezes the it crashes

3. ...