Problem with my loop ? Second loop start when player connect

Hi people, I am actually doing a game with a LobbyServer and a GameServer. In the LobbyServer, there is a looped script. When a player connect to the game, it start loop. But the problem is that when a second player connect, it begin one more time the loop. I tried to correct that with a value which turn true when a player connect and the loop doesn't loop one more time. And now the problem is when a second player connect, the time goes 2 more time faster (it seem like the t = t-1 goes 2 time). Can someone help me ? Thanks for answer :D Here is the code.