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 'LIMIT 1' at line 1
SELECT * FROM forum_post_redbag WHERE pid = LIMIT 1

PHP Debug

No.FileLineCode
1forum.php118require(%s)
2source/module/forum/forum_viewthread.php1231table_forum_post_redbag->fetch_by_pid()
3source/class/table/table_forum_post_redbag.php48discuz_database::fetch_first()
4source/class/discuz/discuz_database.php92discuz_database::query()
5source/class/discuz/discuz_database.php140db_driver_mysqli->query()
6source/class/db/db_driver_mysqli.php147db_driver_mysqli->halt()
7source/class/db/db_driver_mysqli.php222break()
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