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 2
SELECT ff1.`fid`,ff1.`name` FROM forum_forum as ff1,forum_forum as ff2 WHERE ff1.`fid`=ff2.`fup` and ff2.`fid`=

PHP Debug

No.FileLineCode
1forum.php65runhooks()
2source/function/function_core.php1120hookscript(%s, %s, %s, Array, %s, %s)
3source/function/function_core.php1167plugin_baitaishuo_lookportal_forum->viewthread_nav(Array)
4source/plugin/baitaishuo_lookportal/lookportal.class.php28plugin_baitaishuo_lookportal_forum::get_fup(%s)
5source/plugin/baitaishuo_lookportal/lookportal.class.php112discuz_database::fetch_first(%s)
6source/class/discuz/discuz_database.php91discuz_database::query(%s, Array, false, false)
7source/class/discuz/discuz_database.php136db_driver_mysql->query(%s, false, false)
8source/class/db/db_driver_mysql.php153db_driver_mysql->halt(%s, %d, %s)
9source/class/db/db_driver_mysql.php224break()
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