Discuz! Database Error

(1028) Sort aborted:
SELECT tid,fid FROM forum_thread where closed=0 AND replies<2000 order by rand() limit 10

PHP Debug

No.FileLineCode
1forum.php49discuz_application->init()
2source/class/discuz/discuz_application.php70discuz_application->_init_cron()
3source/class/discuz/discuz_application.php482discuz_cron::run()
4source/class/discuz/discuz_cron.php42include(%s)
5source/include/cron/reply_robot_592cx.inc.php94discuz_database::query(%s)
6source/class/discuz/discuz_database.php136db_driver_mysql->query(%s, false, false)
7source/class/db/db_driver_mysql.php151db_driver_mysql->halt(%s, %d, %s)
8source/class/db/db_driver_mysql.php218break()
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