Server Crushes When A Certain Player Joins

So guys i have this problem , when a certain player joins my server the server crashes.
Here is the error http://pastebin.com/8FPsxSN1.
Please Help me i would really appreciate it



(this player is not a hacker he is my friend)

 

What plugins do you have ??????

 

Plugin List is in there winter4w , but how the error message formats it makes it hard to read... :/

It looks like something edited his NBT data and now MC cant read it correctly, You can try deleting his inventory <server-root>/<world>/players/<hisUsername>
The message shows it on world_nether, but I would do it on world and world_the_end too, just to be sure.

 

Yea I am not really sure what it is that seems to be multiple failures.

 

The Minecraft-Crash-Reports likes to say the same error in multiple ways, it's kind of hard to read them.

 

Yea if he post the console log that can be easier to see XD

 

well verygames , where i host the server doesnt have a good console.
Anyway i know for sure that its related with an enchante pickaxe earned from mcmmo but i cant remove it from this player's inventory because when he joins the server crashes and i cant run commands

@Gamecube762 i will try your idea, i think it will solve my problem!
Thank you very much

EDIT by Moderator: merged posts, please use the edit button instead of double posting.