Everytime I join a certain server it crashes leaving me with a crash report

I tried to join a public server and it crashes upon joining.

What I expected to happen was...:
What I expected to happen was a successful sign in and to play.

What actually happened was...:
What actually happened was Minecraft crashed giving me a crash report

Steps to Reproduce:
1. Join the Slimemobs server
2. Minecraft crashes
3. Repeat
3. ...