javascript - Uncaught TypeError: Cannot read property 'top' of undefined -


i have following code , it's returning "uncaught typeerror: cannot read property 'top' of undefined" error in console , can't figure out why? code doing i'd do, i'd not return errors. can point me in right direction?

var sig = false; $(window).on('scroll', function () {     var sigtop = $('.svgwrap').offset().top - 500;     var wintop = $(window).scrolltop();     if (sigtop < wintop && !sig) {         sig = true;         animatesignature();     } })

.svgwrap might not exist when first scroll event fires; include script @ end of page, wrap in $(document).ready, or check .svgwraps.

var sig = false;  $(window).on('scroll', function () {     var svgwrap = $('.svgwrap');      if (!svgwrap.length) {         return;     }      var sigtop = svgwrap.offset().top - 500;     var wintop = $(window).scrolltop();     if (sigtop < wintop && !sig) {         sig = true;         animatesignature();     } });

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