Exception raised when Set User for Document Protection

[Tuo]

Hi Telerik,
      An "Object reference not set to an instance of an object." exception raised ocassionally  when try to set the current user through:
          RadRichTextBox.CurrentUser = user.
          (Before set the current user, PermissionInfo and UserInfo were added correctly)
      And it was set in the handler of event RadRichTextBox.DocumentChanged.
      Could you help to check this issue? Thanks.
     (Version: 2012.2.725.1050)
==================================================================================================== 
      The exception is as follows:  
      ------------------------------------
   at Telerik.Windows.Documents.UI.HeaderPresenter.UpdateSource()
   at Telerik.Windows.Documents.UI.HeaderFooterPresenterBase.BodyRichTextBox_DocumentPresentationChanged(Object sender, EventArgs e)
   at Telerik.Windows.Controls.RadRichTextBox.OnDocumentPresentationChanged()
   at Telerik.Windows.Controls.RadRichTextBox.document_PresentationChanged(Object sender, EventArgs e)
   at Telerik.Windows.Documents.Model.RadDocument.OnPresentationChanged()
   at Telerik.Windows.Documents.Model.RadDocument.RaisePresentationAndContentChange()
   at Telerik.Windows.Documents.Model.RadDocument.InvalidatePermissions()
   at Telerik.Windows.Controls.RadRichTextBox.protectionAuthenticationProvider_AuthenticationDataChanged(Object sender, EventArgs e)
   at System.EventHandler.Invoke(Object sender, EventArgs e)
   at Telerik.Windows.Documents.Model.DefaultCredentialsValidator.OnAuthenticationDataChanged()
   at Telerik.Windows.Documents.Model.DefaultCredentialsValidator.richTextBox_UserInfoChanged(Object sender, EventArgs e)
   at Telerik.Windows.Controls.RadRichTextBox.OnUserInfoChanged()
   at Telerik.Windows.Controls.RadRichTextBox.CurrentUserChangedCallback(DependencyObject sender, DependencyPropertyChangedEventArgs e)
   at Telerik.Windows.PropertyMetadata.PropertyChangeHook.OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.RaisePropertyChangeNotifications(DependencyProperty dp, Object oldValue, Object newValue)
   at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)
   at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value, Boolean allowReadOnlySet, Boolean isBindingInStyleSetter)
   at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   at Telerik.Windows.Controls.RadRichTextBox.set_CurrentUser(UserInfo value)


 ====================================================================================================
       The header and footer in the xaml file are as follows.
       --------------------------------------------------------------------
          <t:Section.Footers>
      <t:Footers>
        <t:Footers.Default>
          <t:Footer IsLinkedToPrevious="False" />
        </t:Footers.Default>
      </t:Footers>
    </t:Section.Footers>
    <t:Section.Headers>
      <t:Headers>
        <t:Headers.Default>
          <t:Header IsLinkedToPrevious="False">
            <t:Header.WatermarkSettings>
              <t:DocumentWatermarkSettings Type="NoWatermark" />
            </t:Header.WatermarkSettings>
          </t:Header>
        </t:Headers.Default>
      </t:Headers>
    </t:Section.Headers>

Best,
Tuo

[Nikolay Demirev]

Hi Tuo,

I was unable to reproduce the issue. Could you provide us with your solution and sample document for testing, so we can investigate the problem?

Looking forward to your reply.

Kind regards,
Nikolay Demirev
the Telerik team