Could not find a position

Hi!

I'm trying to modify a position in my cBot, but when this was triggered by a pending order, i can't find the position and it gives me a error: Crashed in OnTick with NullReferenceException: Object reference not set to an instance of an object.

            var position = Positions.Find(("Trade_" + Chart.SymbolName), Chart.SymbolName);

            // Proteger operação
            if (position.TradeType == TradeType.Sell && protegido == false && ((entryPrice - Bars.ClosePrices[Bars.Count -1]) / Symbol.PipSize) >= pips/2)
            {
                var realEntryPrice = LastResult.Position.EntryPrice;
                var takeProfit = LastResult.Position.TakeProfit;
                

                // HERE WHERE GENERATES THE ERROR
                ModifyPosition(position, realEntryPrice, takeProfit);
                protegido = true;
                
            }

Its weird because if i execute the same code and the order was a marketorder the code works fine.

Could you help me with this?