App error: 'Sorting' is not allowed during an AddNew or EditItem transaction.

[thomas694]

Sometimes users let the app report an error that occurred, but it's unclear which steps caused it.
We have the error message, the stack trace and need to find the root cause...
Any help is welcome.

ExceptionMessage: 'Sorting' is not allowed during an AddNew or EditItem transaction.
ExceptionType: System.InvalidOperationException
Callstack:

at System.Windows.Data.ListCollectionView.SortDescriptionsChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at System.ComponentModel.SortDescriptionCollection.OnCollectionChanged(NotifyCollectionChangedAction action)
at System.Windows.Controls.ItemCollection.CloneList(IList clone, IList master)
at System.Windows.Controls.ItemCollection.SynchronizeCollections[T](NotifyCollectionChangedEventArgs e, Collection1 origin, Collection1 clone)
at System.Windows.Controls.ItemCollection.SortDescriptionsChanged(Object sender, NotifyCollectionChangedEventArgs e)
at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
at System.ComponentModel.SortDescriptionCollection.OnCollectionChanged(NotifyCollectionChangedAction action)
at System.Windows.Controls.DataGrid.DefaultSort(DataGridColumn column, Boolean clearExistingSortDescriptions)
at System.Windows.Controls.DataGrid.OnSorting(DataGridSortingEventArgs eventArgs)
at System.Windows.Controls.DataGrid.PerformSort(DataGridColumn sortColumn)
at System.Windows.Controls.Primitives.DataGridColumnHeader.OnClick()
at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
at System.Windows.Controls.Primitives.DataGridColumnHeader.OnMouseLeftButtonUp(MouseButtonEventArgs e)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

TumblThreeVersion: 2.14.2.457 (64-bit)