CKEditor throws an exception: 'n' is null or not an object

Question

I traced the root of this exception in the sourcearea CKEditor v3.0.1 plugin. This happens (sometimes) after the user has entered the content in the editor, and then clicked the small arrow in the upper right part of the editor (close the arrow of the toolbar). Has anyone seen this problem? We are using IE6.

onResize(){
   textarea.hide();  // EXCEPTION occurs because textarea is null
   textarea.setStyle( 'height', holderElement.$.clientheight + 'px');
   textarea.show();
};

After the problem starts (n = textarea = null), it occurs every time you press the right arrow.

Answer 1

As Pekka suggested, now I check the null value and call it day.