Crash for Specific Server

Put the summary of the bug you're having here

What I expected to happen was...:
I expected to be able to log into mc.obsidianprison.com.

What actually happened was...:
Every time i try to log into the server, my minecraft crashes.

Steps to Reproduce:
1. Log in to minecraft.
2. Open multiplayer tab.
3. Click on mc.obsidianprison.com
4. Game crashes