In ips.ui.infiniteScroll.js you have this method:

			_getPageURL = function (pageNo) {
				return elem.attr('data-ipsInfScroll-url') + '&' + options.pageParam + '=' + parseInt( pageNo );
			},

This does not respect friendly URL. The UI widget attempts to load:
https://example.com/articles/&page=2 (Error 404)

It should be:
https://example.com/articles/page/2/

Thank you, we've made a small adjustment for this to be included in a future release.