Discuz! Database Error

(1028) Sort aborted:
SELECT * FROM forum_thread WHERE fid=2 AND displayorder>=0 ORDER BY `lastpost` DESC LIMIT 1

PHP Debug

No.FileLineCode
1forum.php56discuz_application->init()
2source/class/discuz/discuz_application.php70discuz_application->_init_cron()
3source/class/discuz/discuz_application.php544discuz_cron::run()
4source/class/discuz/discuz_cron.php48include(%s)
5source/include/cron/cron_security_cleanup_lastpost.php16table_forum_thread->fetch_by_fid_displayorder(%s)
6source/class/table/table_forum_thread.php53discuz_database::fetch_first(%s, Array)
7source/class/discuz/discuz_database.php91discuz_database::query(%s, Array, false, false)
8source/class/discuz/discuz_database.php136db_driver_mysql->query(%s, false, false)
9source/class/db/db_driver_mysql.php153db_driver_mysql->halt(%s, %d, %s)
10source/class/db/db_driver_mysql.php224break()
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