Destroy AJAX IE7/8 Error

Can you provide a testcase including all the required code?

I am encountering the same issue but the invalid argument exception is being raised on line 247 of theme.js

/*
          * IE BUG: Removing the editor DOM elements while the selection is inside
          * the editing area would break IE7/8's selection system. So we need to put
          * the selection back to the parent document without scrolling the window.
          * (#3812)
          */
         if ( CKEDITOR.env.ie )
         {
            container.setStyle( 'display', 'none' );

            var $range = document.body.createTextRange();
            $range.moveToElementText( container.$ );
            try
            {
               // Putting the selection to a display:none element - this will certainly
               // fail. But! We've just put the selection document back to the parent
               // document without scrolling the window!
               $range.select();
            }
            catch ( e ) {}
         };

Error is on

$range.moveToElementText( container.$ );

as called from line 480 of editor.js

this.theme.destroy( this );

I am using IE6.

My source code is

    $(this).unbind('mousedown', hasFocus);
                var editor = CKEDITOR.instances[elm.id];
                if (editor) {
                    editor.destroy();
                    Sys.Debug.trace("Editor " + elm.id + " destroyed");
                }

Since the bug fix mentions IE7/8 only I will add a check for

&& CKEDITOR.env.version > 6