problem with setData in Internet Explorer

Hi

I am having some problems when using setData in Internet Explorer. When using it I get the following error 'this.$.innerHTML' is null or not an object'.

This only happens when I use setData in a custom save function I made

  CKEDITOR.plugins.registered['save'] = {
    init: function (editor) {
      var command = editor.addCommand('save',
        {
          modes: {wysiwyg: 1, source: 1},
          exec: function (editor) {
            var data = editor.getData();
            var elem  = $('storeArea');
              elem.update(data);
              editor.setData('');
            }
          }
        }
      );
      editor.ui.addButton('Save', {label: 'Gem', command: 'save'});
    }
  }

I use setData elsewhere on the same page and having no problems with it.

Also this works fine in Firefox.

Does anyone have an idea to what the problem might be?