1.7 crash

My 1.7 have been crashing recently. Server is normally working, with no lag, but sometimes it just becomes unresponsive, server is still running but no one can connect to it. Then I always have to restart server.

The last thing on console is:
[Disconnect] User [20:12:19 INFO]: space has disconnected, reason: Illegal characters in chat

craftbukkit version: 1.7.2-R0.2
plugins: essentials, worldedit, worldguard, worldborder, vault, chestshop, automessage, nocheatplus, residence (all plugins are updated to latest version)

I noticed that crash after updating craftbukkit 1.7.2-R.01 (beta) to 1.7.2-R0.2 (also beta).

 

it could be that the server is having problems handling specific characters in the chat, because the disconnect reason is: Illegal characters in chat

 

Having the same problem, help!!

 

do you have any common plugins? (i'll assume essentials, worldedit and worldguard are)

 

Thanks for trying to help me, but i alredy fixed. The error was that a certain player with the character _ was with his .dat file corrupted, i simply deleted it and in the AuthMe Reloaded config I blocked the _ character, With this the error dissapeared.