Error when deleting old notifications in mysql

[Richard Mansfield]

Cron job to delete old notifications produces an sql error in mysql.

 [WAR] 86 (lib/errors.php:743) Failed to get a recordset: mysql error: [1064: 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 'read = 1
 [WAR] 86 (lib/errors.php:743) AND type IN(
 [WAR] 86 (lib/errors.php:743) SELECT id FROM "mactivity_type' at line 2] in EXECUTE("DELETE FROM "mnotification_internal_activity" WHERE
 [WAR] 86 (lib/errors.php:743) ctime < '2010-06-08 08:45:22'
 [WAR] 86 (lib/errors.php:743) AND read = 1
 [WAR] 86 (lib/errors.php:743) AND type IN(
 [WAR] 86 (lib/errors.php:743) SELECT id FROM "mactivity_type"
 [WAR] 86 (lib/errors.php:743) WHERE name IN ('feedback'))")
 [WAR] 86 (lib/errors.php:743) Command was: DELETE FROM "mnotification_internal_activity" WHERE
 [WAR] 86 (lib/errors.php:743) ctime < ?
 [WAR] 86 (lib/errors.php:743) AND read = 1
 [WAR] 86 (lib/errors.php:743) AND type IN(
 [WAR] 86 (lib/errors.php:743) SELECT id FROM "mactivity_type"
 [WAR] 86 (lib/errors.php:743) WHERE name IN ('feedback')) and values was (2010-06-08 08:45:22)