Directly attaching a handler to the scroll event is considered bad practice because (depending on the browser) this event can fire many times within a few milliseconds. A solution below will be deal with this issue.

Delay scroll to fix issue scroll event handlers

var scrollticker;
    jQuery(window).scroll(function() {
        if (scrollticker) {
            window.clearTimeout(scrollticker);
            scrollticker = null;
        }
        // Set Timeout
        scrollticker = window.setTimeout(function() {
            if (jQuery('#div-fetching').length) {
                if (jQuery(window).scrollTop() >= jQuery('#div-fetching').offset().top + jQuery('#div-fetching').outerHeight() - window.innerHeight) {
                    //code fetching handle matrix
                }
            }
        }, 500); // Timeout in msec
    });