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 username FROM common_member WHERE uid=

PHP Debug

No.FileLineCode
1forum.php67require(%s)
2source/module/forum/forum_viewthread.php851threadplugin_xj_event->viewthread(%s)
3source/plugin/xj_event/event_thread.class.php193xj_eventview::event_view(%d, %s)
4source/plugin/xj_event/include/view.class.php46discuz_database::result_first(%s)
5source/class/discuz/discuz_database.php123discuz_database::query(%s, Array, false, false)
6source/class/discuz/discuz_database.php142db_driver_mysql->query(%s, false, false)
7source/class/db/db_driver_mysql.php152db_driver_mysql->halt(%s, %d, %s)
8source/class/db/db_driver_mysql.php223break()
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