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firebug error message

I have been getting frequently the following error messgae in my firebug window when I Use firefox. Still the application is working fine

selParent.parentNode is null
[Break on this error] {if (width.toString().indexOf("%")!=-1)...ue;this.combo.DOMelem_input.onkeydown(e)

Any suggestion?

Such problem may occur if you creating combo inside element which not attached to DOM
( When width of combo container defined in percents , combo periodically check its parent width, and if combo was removed in some way , mentioned error can occur. )

Attached version must work correctly in such scenario.