Crashes with URLs in the notes section

When I enter a URL in the notes section, like www.abc.html, and then try to add something more, I get a crash like this:

System.InvalidOperationException: Das "Hyperlink" kann an dieser Position nicht getrennt werden.
   bei System.Windows.Documents.Span..ctor(TextPointer start, TextPointer end)
   bei System.Windows.Documents.Hyperlink..ctor(TextPointer start, TextPointer end)
   bei Wieldy.Client.Controls.NotesEditor.AddHyperlink(TextPointer startPosition, TextPointer endPosition)
   bei Wieldy.Client.Controls.NotesEditor.OnKeyDown(Object sender, KeyEventArgs e)
   bei System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   bei System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   bei System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   bei System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
   bei System.Windows.Input.InputManager.ProcessStagingArea()
   bei System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   bei System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   bei System.Windows.Interop.HwndKeyboardInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawKeyboardActions actions, Int32 scanCode, Boolean isExtendedKey, Boolean isSystemKey, Int32 virtualKey)
   bei System.Windows.Interop.HwndKeyboardInputProvider.ProcessKeyAction(MSG& msg, Boolean& handled)
   bei System.Windows.Interop.HwndSource.CriticalTranslateAccelerator(MSG& msg, ModifierKeys modifiers)
   bei System.Windows.Interop.HwndSource.OnPreprocessMessage(Object param)
   bei System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
   bei System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)