Discuz! Database 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 ',yesterdayposts=todayposts' at line 1
UPDATE forum_forum SET oldrank=rank,yesterdayposts=todayposts

PHP Debug

No.FileLineCode
1forum.php56discuz_application->init()
2source/class/discuz/discuz_application.php70discuz_application->_init_cron()
3source/class/discuz/discuz_application.php547discuz_cron::run()
4source/class/discuz/discuz_cron.php48include(%s)
5source/include/cron/cron_todaypost_daily.php16table_forum_forum->update_oldrank_and_yesterdayposts()
6source/class/table/table_forum_forum.php200discuz_database::query(%s)
7source/class/discuz/discuz_database.php137db_driver_mysqli->query(%s, false, false)
8source/class/db/db_driver_mysqli.php147db_driver_mysqli->halt(%s, %d, %s)
9source/class/db/db_driver_mysqli.php222break()
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