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 groupid,grouptitle FROM common_usergroup WHERE groupid=

PHP Debug

No.FileLineCode
1forum.php72require(%s)
2source/module/forum/forum_viewthread.php1004include(%s)
3data/template/7_diy_forum_viewthread.tpl.php127discuz_database::fetch_first(%s)
4source/class/discuz/discuz_database.php92discuz_database::query(%s, Array, false, false)
5source/class/discuz/discuz_database.php137db_driver_mysql->query(%s, false, false)
6source/class/db/db_driver_mysql.php152db_driver_mysql->halt(%s, %d, %s)
7source/class/db/db_driver_mysql.php223break()
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