Recurring database error
 

<div>I'm receiving database error warning via email at least twice a day. It's the same error each time and I can't work it out. Here's the error:

<div class="bbcode_container"> Code:
Database error in vBulletin 3.8.5:

Invalid SQL:

DELETE FROM lgv
WHERE (lastactivity + ( * 86400)) < 1272184453;

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 '* 86400))