OnBar - instead of just single order it creates multiple orders

Hi fellow traders,

I have made robot, and in OnBar() I have placed 2 simple pending stop orders (one for buy and one for sell).

but when bar is completed and on next tick, it sends 4 orders..2 for buy and 2 for sell with same levels and same volume.

How I can limit it to only send one order for buy and one for sell.

This is how orders looks like..also before sending order condition must be checked...if position already exists

please help, thanks

              
      if ( pos_long == null )
 {

                    PlaceStopOrder(TradeType.Buy, Symbol, volume, MarketSeries.High.Last(1), "MYBC", (MarketSeries.High.Last(1) - MarketSeries.Low.Last(1)) / Symbol.PipSize, takeProfit, MarketSeries.OpenTime.LastValue.AddMinutes(duration.Minutes).AddSeconds(duration.Seconds - 1), "long");
          
                }


                if ( pos_short == null )
                {

                    PlaceStopOrder(TradeType.Sell, Symbol, volume, MarketSeries.Low.Last(1), "MYBC", (MarketSeries.High.Last(1) - MarketSeries.Low.Last(1)) / Symbol.PipSize, takeProfit, MarketSeries.OpenTime.LastValue.AddMinutes(duration.Minutes).AddSeconds(duration.Seconds - 1), "short");

                }