Exception при генераци XML отчёта [3.0.11]

System.ArgumentException was unhandled
Message=Котировка для направления Sell отсутствует.
Parameter name: bestPair
Source=Ecng.Trading.Algo
ParamName=bestPair
StackTrace:
at Ecng.Trading.Algo.TraderHelper.GetMarketPrice(MarketDepthPair bestPair, OrderDirections direction, Unit priceDelta, MarketPriceTypes priceType)
at Ecng.Trading.Algo.TraderHelper.GetMarketPrice(MarketDepth depth, OrderDirections direction, Unit priceDelta, MarketPriceTypes priceType)
at Ecng.Trading.Algo.TraderHelper.GetMarketPrice(Security security, OrderDirections direction, Unit priceDelta, MarketPriceTypes priceType)
at Ecng.Trading.Algo.TraderHelper.GetPnL(Security security, Int64 position)
at Ecng.Trading.Algo.PnL.BasePnLManager.#=q836kuXrCbvnCKEJj5Cbj2g==(KeyValuePair`2 #=qhm9jo7HetgxyijS5fWjtCA==)
at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.Sum(IEnumerable`1 source)
at Ecng.Trading.Algo.PnL.BasePnLManager.#=q2do1oc9dZRDiwTtYLiYssg==(SynchronizedDictionary`2 #=qWPvwsgC0Ugb3v9rxLZzh4w==)
at Ecng.Collections.CollectionHelper.SyncGet[TCollection,TResult](TCollection collection, Func`2 func)
at Ecng.Trading.Algo.PnL.BasePnLManager.get_PnL()
at Ecng.Trading.Algo.Reporting.XmlStrategyReport.Generate()
at Robots.MainWindow.MainWindow.GenerateStrategyReports(Strategy strategy) in c:\Users\Alexander\Documents\Visual Studio 2010\Projects\Robots\Robots\MainWindow\MainWindow.xaml.cs:line 65
at Robots.MainWindow.MainWindow.OnClosing(CancelEventArgs e) in c:\Users\Alexander\Documents\Visual Studio 2010\Projects\Robots\Robots\MainWindow\MainWindow.xaml.cs:line 130
.......
InnerException: