[Nook_Neformat]

hi, everyone, i need your help
some users sometimes are going into this page:
/forum/post_thanks.php
and i have db error there:

Database error in vBulletin 3.8.4:

Invalid SQL:
SELECT * FROM vb_post_thanks AS post_thanks INNER JOIN vb_user AS user USING (userid) WHERE post_thanks.postid IN () ORDER BY post_thanks.username ASC;

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 ') ORDER BY post_thanks.username ASC' at line 1
Error Number : 1064
Request Date : Friday, January 15th 2010 @ 05:10:46 PM
Error Date : Friday, January 15th 2010 @ 05:10:46 PM
Script : ---/forum/post_thanks.php
Referrer :
IP Address : ---
Username : ---
Classname : vB_Database
MySQL Version :

on other forums this page just returns blank. so if someone could help me, i will be grateful )