title: IE11 - Object reference not set to an instance of an object at FreeTextBox.RenderTabs
body: <p>I have integrated freetext box with website.</p>
  
  <p>It's working well for all browser except recently release IE 11.</p>
  
  <p>It throws error "Object reference not set to an instance of an object."</p>
  
  <p>Following is the error stack trace:</p>
  
  <pre><code> at FreeTextBoxControls.FreeTextBox.RenderTabs(HtmlTextWriter writer) at
   FreeTextBoxControls.FreeTextBox.RenderRichEditor(HtmlTextWriter writer) at
   FreeTextBoxControls.FreeTextBox.Render(HtmlTextWriter writer) at
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) at
   ASP.myaspxpage.__Render__control4(HtmlTextWriter __w, Control parameterContainer) in
   pathtomyaspxpage:line 505 at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer,
   ICollection children) at System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) at
   System.Web.UI.Control.Render(HtmlTextWriter writer) at
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) at
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) at
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) at
   System.Web.UI.UpdatePanel.RenderChildren(HtmlTextWriter writer) at
   System.Web.UI.UpdatePanel.Render(HtmlTextWriter writer) at
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) at
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) at
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) at
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) at
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) at
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) at
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) at
   System.Web.UI.Control.Render(HtmlTextWriter writer) at
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) at
   mymasterpage.__Renderform1(HtmlTextWriter __w, Control parameterContainer) in
   pathtomymasterpage:line 87 at System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriterwriter, 
   ICollection children) at System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter
   writer) at System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) at
   System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) at
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) at
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) at
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) at
   System.Web.UI.Control.Render(HtmlTextWriter writer) at
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) at
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) at
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) at
   System.Web.UI.Page.Render(HtmlTextWriter writer) at
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) at
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) at
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean
   includeStagesAfterAsyncPoint)
  </code></pre>
  
  <p>Any help would be appreciated.</p>
  
  <p>Thanks</p>