[Seven_of_Nine]

pawn Код:

//updated
new pTimer[MAX_PLAYERS];

public OnPlayerDisconnect(playerid, reason)
{
    KillTimer(pTimer[playerid]);
    return 1;
}

public OnPlayerSpawn(playerid)
{
    new GameTimer;
    pTimer[playerid] = SetTimerEx("GameTime",1000,1,"i",playerid);
    return 1;
}

Try this.

I'd do it with PVars, then save it to an .ini file on disconnect. ; )

EDIT: Whoops. You should define a timer for every single player. Updated.