Issue: Mediawiki Import Stops on Step 2

Database error in vBulletin 4.1.3:

Invalid SQL:

			SELECT page.page_id AS import_page_id, page.page_namespace AS namespaceid,
				page.page_title AS title, rev.rev_user_text AS ipaddress,
				rev.rev_timestamp AS dateline, txt.old_text AS pagetext, txt.old_flags AS flags,
				usr.user_name AS username, rev.rev_minor_edit AS minor, rev.rev_comment AS reason
			FROM page AS page
			LEFT JOIN revision AS rev ON (rev.rev_page = page.page_id AND rev.rev_id = page.page_latest)
			LEFT JOIN text AS txt ON (txt.old_id = rev.rev_text_id)
			LEFT JOIN user AS usr ON (usr.user_id = rev.rev_user)
			WHERE page.page_namespace IN ()
			GROUP BY page.page_id
			ORDER BY rev.rev_timestamp
			LIMIT 0,50;

MySQL Error   : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')
			GROUP BY page.page_id
			ORDER BY rev.rev_timestamp
			LIMIT 0,50' at line 9
Error Number  : 1064
Request Date  : Friday, May 13th 2011 @ 11:21:03 PM
Error Date    : Friday, May 13th 2011 @ 11:21:03 PM
IP Address    : 72.229.162.172
Username      : Harley
Classname     : vB_Database
MySQL Version : 5.0.77