Upgraded for 3.0.8 to 3.6.8 and now DB error: DELETE FROM access WHERE forumid IN...

[RS25.com]

I recently upgraded my forums from 3.0.8 to 3.6.8 and everything seems to have gone smoothly. However, every night a cron job seems to run and I get this error emailed to me:

Database error in vBulletin 3.6.8:

Invalid SQL:

DELETE FROM access
WHERE forumid IN (a:2:{i:66;s:1:"1";i:14;s:1:"1";}) AND
userid = 10607;

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 ':2:{i:66;s:1:"1";i:14;s:1:"1";}) AND
userid = 10607' at line 2
Error Number : 1064
Date : Thursday, September 6th 2007 @ 04:00:03 AM
Script : http://www.mysite.com/forums/cron.php?&rand=542426
Referrer : http://www.mysite.com/forums/
IP Address : 72.193.xxx.xxx
Username : Unregistered

I'm not sure what this is, can someone help fix this please?

[Steve Machol]

Invalid SQL errors are almost always related to modified code. To troubleshoot this, the first thing you need to do is remove
any hacks or plugins, then see if you still have this problem.

If so, reupload all the original vB non-image files (except install.php). Make sure you upload these in ASCII format and overwrite the ones on the server.