JavaScript error: this.parent has no properties

[filip.hrbek]

From time to time, opening a modal dialog fails on this JavaScript error:

this.parent has no properties

in

http://[basepath]/a4j.res/org/richfaces/renderkit/html/scripts/modalPanel.js
Line: 30

Line content:
...
if(this.lastOutside){Event.stopObserving(this.lastOutside,"focus",this.eventLastOnfocus);this.lastOutside=null;}},show:function(opts){this.preventFocus();if(!this.floatedToBody){this.parent=this.id.parentNode;document.body.insertBefore(this.parent.removeChild(this.id),null);this.floatedToBody=true;}
...

If the page is rendered the first time, it works. If a part of the page is ajax rerendered, it sometimes fails.

Does anyone has similar experience? If so, how to avoid this problem?

Thanks,

Filip

[ilya_shaikovsky]

please paste code snipet.

[filip.hrbek]

I'm not sure which part of the code is relevant, so I'm posting full HTML and appropriate ajax js code:

HTML: http://www.volny.cz/filip.hrbek/tmp/modalPanel.html
JS: http://www.volny.cz/filip.hrbek/tmp/modalPanel.js

Look for "Richfaces.showModalPanel('resolveToBom')" - this action fails on the described error.