Database Error When Searching by Username

[Spika]

Hello again, I have this error:

Database error in vBulletin 3.7.4:

Invalid SQL:

			SELECT links.linkid
			FROM vb_adv_links AS links
			 LEFT JOIN vb_adv_links_posts AS posts ON (posts.linkid = links.linkid) LEFT JOIN vb_adv_links_posts AS posts ON (posts.linkid = links.linkid)
			
			WHERE  (links.userid IN(79) OR posts.userid IN(79)) AND links.valid IN(0, 1, 2)
		ORDER BY links.name ASC LIMIT 500;

MySQL Error   : Not unique table/alias: 'posts'
Error Number  : 1066
Request Date  : Friday, January 2nd 2009 @ 12:38:22 PM
Error Date    : Friday, January 2nd 2009 @ 12:38:22 PM
Script        : http://www.gstrail.es/foro/links/search.php
Referrer      : http://www.gstrail.es/foro/links/search.php
IP Address    : 212.15.224.103
Username      : JOUGS
Classname     : vB_Database
MySQL Version : 5.0.45

Thanks