[Konstantinos]

Because it keeps calling the timer.

pawn Код:

// OnPlayerConnect: 
ReduceTimer[playerid] = -1;

// OnPlayerUpdate:
if(GetPlayerWantedLevel(playerid) >= 1 && ReduceTimer[playerid] == -1)
{
    ReduceTimer[playerid] = SetTimerEx("ReduceWantedLevel", 120000, false, "i", playerid);
}

forward ReduceWantedLevel(playerid);
public ReduceWantedLevel(playerid)
{
    if (GetPlayerWantedLevel(playerid) >= 1) SetPlayerWantedLevel(playerid, GetPlayerWantedLevel(playerid) -1);
    else 
    {
        KillTimer(ReduceTimer[playerid]);
        ReduceTimer[playerid] = -1;
    }
}