[Mediawiki-api] About the Page id in recent change list

Hi mediawiki-api, Recently we encounter some recent changes like: *http://commons.wikimedia.org/w/api.php?action=query&continue=-%7C%7C&rccontinue=20150104205209%7C147307576&list=recentchanges&rclimit=1&rcprop=comment%7Cflags%7Cids%7Cloginfo%7Csizes%7Ctimestamp%7Ctitle%7Cuser <http://commons.wikimedia.org/w/api.php?action=query&continue=-%7C%7C&rccontinue=20150104205209%7C147307576&list=recentchanges&rclimit=1&rcprop=comment%7Cflags%7Cids%7Cloginfo%7Csizes%7Ctimestamp%7Ctitle%7Cuser>* I am wondering why the page id is 0. Thanks Lin Jin