Error while player connecting

Hey,
So, there's been a user trying to connect to my server. However, while he joins he spawns but 5 seconds later he crash's.

Bungee-Cord log: http://pastebin.com/1rduj9j3
BungeeCord config.yml: http://pastebin.com/9MQsZfDb (I removed the ports for security reasons)
BungeeCord version: 20:33:51 [INFO] This server is running BungeeCord version git:BungeeCord-Bootstrap:1.7-SNAPSHOT:"312a74c":902 by md_5

Honestly don't know what this error is.