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 ')' at line 1
SELECT SUM(viewnum) as num FROM portal_article_count WHERE aid IN ()

PHP Debug

No.FileLineCode
1portal.php32require_once(%s)
2source/module/portal/portal_view.php35table_portal_article_count->fetch_article_view(%s)
3source/class/table/table_portal_article_count.php48discuz_database::fetch_first(%s)
4source/class/discuz/discuz_database.php91discuz_database::query(%s, Array, false, false)
5source/class/discuz/discuz_database.php136db_driver_mysql->query(%s, false, false)
6source/class/db/db_driver_mysql.php153db_driver_mysql->halt(%s, %d, %s)
7source/class/db/db_driver_mysql.php224break()
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