[Theme Pursuit] javascript error

Hi all,

Am using the Pursuit theme and all works fine.
Only one javascript error that bugs me: the only info I got is that the bugs’s in main.js on line 625 and it’s an empty string for getElementById.
Now I’ve looked at that specific line and this is what it says:

if ( document.getElementById(tgt) ) {

The whole scriplet is:

.ready(function() {
      jQuery(window).bind('hashchange', function(event) {
        var tgt = location.hash.replace(/^#\/?/,'');

		if ( document.getElementById(tgt) ) {

			// There are a few offsets that need to be calculated
			var smoothScroll_offset = 0;
			var navbar_collapse_offset = 0;
			if (jQuery("header").hasClass("headhesive--clone")) {
				smoothScroll_offset = jQuery(".headhesive--clone").height() ;
				if(jQuery("header nav.navbar-collapse").hasClass("in")){
					navbar_collapse_offset = jQuery("header nav.navbar-collapse.in").height() ;
					smoothScroll_offset =  smoothScroll_offset - navbar_collapse_offset;
				}
			}

			jQuery.smoothScroll({offset: -smoothScroll_offset, scrollTarget: '#' + tgt,
				beforeScroll: function() { // Close Mobile Menu
					var bsNav = jQuery('header .navbar-collapse');

					if (bsNav.hasClass("collapse in")) {
						bsNav.removeClass("in");
						//mainNav.removeClass("open");
					}
				},
				afterScroll: function() {  // Update Active Links, but not for mobile / touch
					if(!isTouch){
					var links = jQuery('nav ul.navbar-nav').find('li.th-anchor a');

						jQuery(links).each(function() {
							var hashtag = jQuery(this).attr('href').split('#')[1];
							if(hashtag === tgt){
								jQuery(this).parent('li').addClass('active');
							}else{
								jQuery(this).parent('li').removeClass('active');
							}
						});
					}
				}

			});
        }
      });
      jQuery(window).trigger('hashchange');

Any thoughts?