I tried logging into the Hypixel server and then Minecraft crashed.

I was playing minecraft and then I tried to join the Hypixel server (I can log onto other servers just fine.) but then Minecraft crashed.
What I expected to happen was...:
I would log into the Hypixel server and be able to play

What actually happened was...:
It started downloading the terrain and then my Minecraft window closed and I recieved a crash report