When I die on the server thenexusmc.net minecraft crashes

Put the summary of the bug you're having here

What I expected to happen was that I would play the server without problems and have fun playing.

What actually happened was when I would get killed by someone, minecraft would crash everytime

Steps to Reproduce:
1. Join the server thenexusmc.net
2. Right click compass and choose Capture the Flag
3. Go to the signs and join a game
4. Wait until a map is chosen
5. Choose a random class then let yourself get killed