Minecraft Username: ECE030201 (My brother, The_lukeanator8, also experiences this exact problem)

Brief Description: Every time I try to do /spawn, my whole Minecraft shuts down. I don't know whether this is because my own Minecraft program is glitching, or the server, but it only happens on this one. Now, I tried to log in, and because I was at spawn already, my game crashed. Not good. If it helps, my brother and I both play on 1.7.10.

Instructions:
1.) For me, all that needs to happen is to /spawn
2.) And now, whenever I log in my Minecraft crashes

How many times did you recreate this bug?: Gee, I dunno, everytime I log in now. Before, /spawn only worked 1/5 times and my game crashed the other 4/5 times.

Result: My game crashes and a weird crash report comes up.

Expected Result: The server would teleport me to spawn without complication. I think maybe this whole problem might have to do with the world in which spawn lies, not the actual teleportation itself.

Evidence: I have posted an image of the error report here: http://imgur.com/jWZLOhA
I can also copy the full error report here, if needed.

 

Okay, thank you! :)