Issue: SQL Error Getting IP

Database error in vBulletin 3.8.5:

Invalid SQL:

		SELECT postid, thread.threadid, firstpostid
			
			, thread.vault_description
			, art.languageid, art.groupid
		FROM post AS post
		INNER JOIN thread AS thread ON (post.threadid = thread.threadid)
		LEFT JOIN vault_article AS art ON (thread.threadid = art.threadid)
		WHERE post.threadid IN ();

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 ')' at line 8
Error Number  : 1064
Request Date  : Thursday, May 13th 2010 @ 04:33:38 AM
Error Date    : Thursday, May 13th 2010 @ 04:33:38 AM
Script        : http://***/forum/postings.php?do=getip&p=
Referrer      : 
IP Address    : ***
Username      : ***
Classname     : vB_Database
MySQL Version : 5.1.37