Database error in vBulletin 3.6.3:

Invalid SQL:

					INSERT INTO postindex_temp41418
						(wordid, postid, intitle, score)
					SELECT wordid, CASE postid WHEN 160490 THEN 
WHEN 160502 THEN 
 ELSE postid END AS postid,
						intitle, score
						FROM postindex AS postindex
						WHERE postid IN (160490,160502);

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 'WHEN 160502 THEN 
 ELSE postid END AS postid,
						intitle, score
						FROM po' at line 4
Error Number : 1064
Date         : Saturday, February 24th 2007 @ 10:46:32 AM
Script       : http://www.------------.com/postings.php?do=domovethread&t=41416
Referrer     : http://www.------------.com/postings.php?t=41416&pollid=
IP Address   : --------------
Username     : --------------
Classname    : vb_database