if you not login , view any page of confluence

will got a javascript error.

because :

#if ($action.isPrintableVersion() == false)
<script type="text/javascript">
// if there is javascript support, enable the [Edit] link that enables AJAX label adding/removing functionality
document.getElementById('editLabelsLink').style.display = 'inline';
</script>
#end

if not login,then no the link,so error occur