Wikimedia Bugzilla is closed!

In the tabbedprefs function, there are some lines that look like this:

legends[0].className = 'mainLegend';
if (legends[0] && legends[0].firstChild.nodeValue) {
    sections[seci].text = legends[0].firstChild.nodeValue;
} else {
	sections[seci].text = '# ' + seci;
}

The first line up there should be inside an if(legends[0]) block as well to make sure legends[0] exists.