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 b.first=1' at line 1
select count(*) from forum_thread a join forum_post b on a.tid=b.tid where a.attachment!=0 and a.displayorder>=0 and a.fid in() and b.first=1

PHP Debug

No.FileLineCode
1plugin.php47include(%s)
2source/plugin/forum_index/forum_index.inc.php22discuz_database::result_first(%s)
3source/class/discuz/discuz_database.php117discuz_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)
6source/class/db/db_driver_mysql.php224break()
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