vB DB Error for forum section.

[TheATHEiST]

I seem to be getting vB error reports sent to my email for a specific forum but cant seem to find which forum its supposed to be and when I use the edit url for teh ID via admincp it says invalid ID so im assuming its a forum ive deleted.

Ive deleted a few forums recently but cant see how users are still linking to them or why it would give a db error?

Does anybody know what the problem could be or what I can do to repair db?

Database error in vBulletin 3.7.4:

Invalid SQL:
SELECT * FROM thread WHERE forumid =  AND threadjaq <> '' ORDER BY threadid DESC LIMIT 20;

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 'AND threadjaq <> '' ORDER BY threadid DESC LIMIT 20' at line 1
Error Number  : 1064
Request Date  : Friday, June 18th 2010 @ 05:59:27 AM
Error Date    : Friday, June 18th 2010 @ 05:59:27 AM
Script        : http://forum/forumdisplay.php?f=67
Referrer      : 
IP Address    : 
Username      : 
Classname     : vB_Database
MySQL Version : 5.0.91-community