[Mugala]

you have to create a separate variable for this timer.
for example TimerStopJobTimer[MAX_PLAYERS];
than you have to start a timer like this.
TimerStopJobTimer[playerid] = SetTimerEx("TimerStopJob", 30000, 0, "i", playerid);
and kill must be this
KillTimer(TimerStopJobTimer[playerid]);