Discuz! Database Error

(1028) Sort aborted
SELECT DISTINCT t.* FROM `forum_thread` t WHERE t.readperm='0' AND t.special IN ('0') AND t.isgroup='0' AND t.displayorder>='0' ORDER BY t.lastpost DESC LIMIT 0,8;

PHP Debug

No.FileLineCode
1index.php126require(%s)
2forum.php71require(%s)
3source/module/forum/forum_index.php432include(%s)
4data/template/3_diy_forum_discuz.tpl.php611output()
5source/function/function_core.php1018block_updatecache(%s)
6source/function/function_block.php237block_thread->getdata(Array, Array)
7source/class/block/forum/block_thread.php362discuz_database::query(%s)
8source/class/discuz/discuz_database.php136db_driver_mysql->query(%s, false, false)
9source/class/db/db_driver_mysql.php151db_driver_mysql->halt(%s, %d, %s)
10source/class/db/db_driver_mysql.php218break()
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