System.NullReferenceException: Riferimento a un oggetto non impostato su un'istanza di oggetto.
   in Octgn.Play.Gui.GroupWindow.<>c__DisplayClass7.<FilterChanged>b__2(Card c)
   in Octgn.Play.Gui.CardListControl.FilterDisplayedCards(Object item)
   in Octgn.Controls.ListCollectionView.PrepareLocalArray(IList list)
   in Octgn.Controls.ListCollectionView.RefreshOverride()
   in Octgn.Controls.CollectionView.RefreshInternal()
   in Octgn.Controls.CollectionView.Refresh()
   in Octgn.Play.Gui.CardListControl.set_FilterCards(Predicate`1 value)
   in Octgn.Play.Gui.GroupWindow.FilterChanged(Object sender, TextChangedEventArgs e)
   in System.Windows.Controls.TextChangedEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   in System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   in System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   in System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   in System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   in System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
   in System.Windows.Controls.Primitives.TextBoxBase.OnTextChanged(TextChangedEventArgs e)
   in System.Windows.Controls.Primitives.TextBoxBase.OnTextContainerChanged(Object sender, TextContainerChangedEventArgs e)
   in System.Windows.Controls.TextBox.OnTextContainerChanged(Object sender, TextContainerChangedEventArgs e)
   in System.Windows.Documents.TextContainerChangedEventHandler.Invoke(Object sender, TextContainerChangedEventArgs e)
   in System.Windows.Documents.TextContainer.EndChange(Boolean skipEvents)
   in System.Windows.Documents.TextContainer.System.Windows.Documents.ITextContainer.EndChange(Boolean skipEvents)
   in System.Windows.Documents.TextRangeBase.EndChange(ITextRange thisRange, Boolean disableScroll, Boolean skipEvents)
   in System.Windows.Documents.TextRange.System.Windows.Documents.ITextRange.EndChange(Boolean disableScroll, Boolean skipEvents)
   in System.Windows.Documents.TextRange.ChangeBlock.System.IDisposable.Dispose()
   in System.Windows.Documents.TextEditorTyping.DoTextInput(TextEditor This, String textData, Boolean isInsertKeyToggled, Boolean acceptControlCharacters)
   in System.Windows.Documents.TextEditorTyping.TextInputItem.Do()
   in System.Windows.Documents.TextEditorTyping.ScheduleInput(TextEditor This, InputItem item)
   in System.Windows.Documents.TextEditorTyping.OnTextInput(Object sender, TextCompositionEventArgs e)
   in System.Windows.Controls.Primitives.TextBoxBase.OnTextInput(TextCompositionEventArgs e)
   in System.Windows.UIElement.OnTextInputThunk(Object sender, TextCompositionEventArgs e)
   in System.Windows.Input.TextCompositionEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   in System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   in System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   in System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   in System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   in System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
   in System.Windows.Input.InputManager.ProcessStagingArea()
   in System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   in System.Windows.Input.TextCompositionManager.UnsafeCompleteComposition(TextComposition composition)
   in System.Windows.Input.TextCompositionManager.PostProcessInput(Object sender, ProcessInputEventArgs e)
   in System.Windows.Input.InputManager.ProcessStagingArea()
   in System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   in System.Windows.Input.TextCompositionManager.UnsafeStartComposition(TextComposition composition)
   in System.Windows.Input.TextCompositionManager.PostProcessInput(Object sender, ProcessInputEventArgs e)
   in System.Windows.Input.InputManager.ProcessStagingArea()
   in System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   in System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   in System.Windows.Interop.HwndKeyboardInputProvider.ProcessTextInputAction(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   in System.Windows.Interop.HwndSource.OnPreprocessMessage(Object param)
   in System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
   in System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
   in System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
   in System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Boolean isSingleParameter)
   in System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)
   in System.Windows.Interop.HwndSource.OnPreprocessMessageThunk(MSG& msg, Boolean& handled)
   in System.Windows.Interop.HwndSource.WeakEventPreprocessMessage.OnPreprocessMessage(MSG& msg, Boolean& handled)
   in System.Windows.Interop.ComponentDispatcherThread.RaiseThreadMessage(MSG& msg)
   in System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   in System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   in System.Windows.Threading.Dispatcher.Run()
   in System.Windows.Application.RunDispatcher(Object ignore)
   in System.Windows.Application.RunInternal(Window window)
   in System.Windows.Application.Run(Window window)
   in System.Windows.Application.Run()
   in Octgn.OctgnApp.Main()