[Sawalha]

well yea as the guy above me mentioned, i just noticed that data are going to be overwritten if the string going to be formatted in the same moment (player connects and one disconnects in the same time), however, that rarely happens, but still it can happen so.. you have to use a single string for each command / function / callback...
you can see what ****** said in that topic that Konstantinos given you it's link..
i apologize for giving you incorrect info, i never thought that data would be overwritten...