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 'and sid != 0 limit 4' at line 1
SELECT * FROM ser_item where cid = and sid != 0 limit 4

PHP Debug

2source/plugin/cxy_dev_service/cxy_dev_service.inc.php275discuz_database::fetch_all(%s, Array)
3source/class/discuz/discuz_database.php100discuz_database::query(%s, Array, false, false)
4source/class/discuz/discuz_database.php136db_driver_mysql->query(%s, false, false)
5source/class/db/db_driver_mysql.php153db_driver_mysql->halt(%s, %d, %s)
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