Smooth Scroll offset fehlerhaft

<script>
$(document).ready(function(){
$('a[href*="#"]:not([href="#"]):not([data-toggle])').click(function() {
        if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'')
        && location.hostname == this.hostname) {
          var $target = $(this.hash);
          $target = $target.length && $target
          || $('[name=' + this.hash.slice(1) +']');
          if ($target.length) {
            var targetOffset = $target.offset(150).top -105;
            $('html,body')
            .animate({scrollTop: targetOffset}, 1000);
           return false;
          }
        }
      });
    });
</script>