[RenSoprano]

pawn Код:

CMD:course(playerid, params[])
{
    new id, string[128], course, rand = random(1000);
    if(sscanf(params, "ui", id, course))
    {
        SendClientMessage(playerid, White, "Use: /course [playerid] [course ID]");
        SendClientMessage(playerid, White, "Courses: ID:1 - Stop course, ID:2 - Driving 1");
    }
    if(course > 2) SendClientMessage(playerid, White, "There are only 2 courses yet.");
    if(id == INVALID_PLAYER_ID && course == 1 && course <= 2)
    {
        SetPlayerVirtualWorld(id, 0);
        SendClientMessage(id, White, "Your virtual world was set to 0, and course stopped.");
    }
    if(id != INVALID_PLAYER_ID && course == 2 && course <= 2)
    {
        SetPlayerVirtualWorld(playerid, rand);
        SetPlayerVirtualWorld(id, rand);
        format(string, sizeof(string), "Your virtual world was set to %d, and 'Driving 1' course started.", rand);
        SendClientMessage(playerid, White, string);
        SendClientMessage(id, White, string);
        SetVehicleVirtualWorld(AddStaticVehicle(566, 1777.1274, -1908.1166, 13.3872, 270, 0, 0), rand);
        SetVehicleVirtualWorld(AddStaticVehicle(596, 1785.6792, -1908.1118, 13.1205, 270, 0, 0), rand);
    }
    return 1;
}

Now it won't double anymore