Errors using 1.7.10 protocolhack

[itpao25]

I get these errors when player in ct left the game or kick, spam this error:

http://pastebin.com/44cRfa0a
http://pastebin.com/Y5qDpELM
http://pastebin.com/RPuZdZW6

Version:
CombatTag v7.0.0-beta-1-SNAPSHOT

Thanks for the support