doEnsureBufferZone: function() {
            var me = this,
                list = me.cmp,
                store = list.getStore(),
                scroller = list.getScrollable(),
                count = store && store.getCount(),
                bufferZone = me.getBufferZone(),
                item, box, y, index;


            if (!store || !count || !scroller || me.getLoading()) {
                return;
            }


            index = Math.min(Math.max(0, count - bufferZone), count - 1);
            item = list.mapToItem(store.getAt(index));


            // OLD code
            // box = item && item.element.getBox();


            // NEW code starts
            if (item.element) {
                box = item && item.element.getBox();
            } else {
                if (item.el) {
                    box = item && item.el.getBox();
                } else {
                    return;
                }
            }
            // NEW Code ends
            if (!box) {
                return;
            }


            // if bufferZone is 0, loading the next page should happen when reaching the end
            // of the list (the bottom of the last item), else, if bufferZone is greater than
            // 0, loading the next page should happen when the first row of pixels of the
            // leading buffer zone item appears in the view.
            y = bufferZone > 0 ? box.top + 1 : box.bottom;
            if (y > scroller.getElement().getBox().bottom) {
                return;
            }


            me.loadNextPage();
        },
24 Jan 2018, 9:23 AM #2
elkentzo yaxidaxilstawskitheposeidon