Sometimes, when validating the current page we get an undefined and Xporter button doesn't work

AJS.$(window).load(function () {
    var pageSelected = AJS.$(".aui-nav-selected > a").attr('data-link-id');
    switch (pageSelected) {
        case backlogPage:
        case activeSprintPage:
        case kanbanPage:
            handleAgileClick();
            break;
        case releasesPage:
            if (AJS.XP.settings.get('ENABLE_XPORTER_FOR_AGILE').value == "false") {
                return;
            }
            handleReleaseClick();
            //Release detail page
            if (AJS.$('#release-report').length > 0) {
                fireXporterforAgileReleaseDetail();
            }
            break;
        default:
            break;
    }
});