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 medal_id >0 order by id desc' at line 1
select * from mag_user_medal_realtion WHERE user_id= AND medal_id >0 order by id desc

PHP Debug

No.FileLineCode
1forum.php67require(%s)
2source/module/forum/forum_viewthread.php1013include(%s)
3data/template/5_diy_forum_viewthread.tpl.php2263get_uid_medal(%s)
4extend/php/vzfunction.php266discuz_database::fetch_all(%s)
5source/class/discuz/discuz_database.php106discuz_database::query(%s, Array, false, false)
6source/class/discuz/discuz_database.php142db_driver_mysqli->query(%s, false, false)
7source/class/db/db_driver_mysqli.php149db_driver_mysqli->halt(%s, %d, %s)
8source/class/db/db_driver_mysqli.php224break()
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