Ck editor Error

I have used Ckeditor within the textbox of asp.net  for spell checker event .Spell checker works fine in case of key up and keydown event.On first submission there is no error in it.But on reclicking the submit event an error arsises return i&&new g(i.contentWindow.document) .Still i am removing the instance and recreating the same instance on ajax postback error.Please suggest the fine solution