Getting errors while trying to read the content from Radeditor after we changed the font type/size

[Malleswara]

Hi,
Getting the similar error while I am trying to change the font style and size in radeditor. This is happening when I use ContentAreaMode="Div".
Any suggestions please.

Uncaught TypeError: Cannot read property 'length' of undefined
    at Function.Sys.UI.DomEvent._removeHandler (Telerik.Web.UI.WebResource.axd:6)
    at Sys.UI.DomEvent.removeHandler (Telerik.Web.UI.WebResource.axd:6)
    at Telerik.Web.UI.Editor.FontNameDropDown.detachEventHandlers (Telerik.Web.UI.WebResource.axd:5055)
    at Telerik.Web.UI.Editor.FontNameDropDown.dispose (Telerik.Web.UI.WebResource.axd:4988)
    at Function.Type.callBaseMethod (Telerik.Web.UI.WebResource.axd:6)
    at Telerik.Web.UI.Editor.FontNameDropDown.dispose (Telerik.Web.UI.WebResource.axd:5206)
    at Sys._Application.disposeElement (Telerik.Web.UI.WebResource.axd:6)
    at Sys.WebForms.PageRequestManager._updatePanel (Telerik.Web.UI.WebResource.axd:15)
    at Sys.WebForms.PageRequestManager._scriptIncludesLoadComplete (Telerik.Web.UI.WebResource.axd:15)
    at Sys.WebForms.PageRequestManager.<anonymous> (Telerik.Web.UI.WebResource.axd:6)

Thanks,
Sailaja.