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 '\xEF\xBC\x8C300\xEF\xBC\x8C500' at line 1
select count(*) as num from forum_thread where fid in(19) and displayorder>=0 and attachment=2 and recommend_add>=0,300,500

PHP Debug

No.FileLineCode
1plugin.php47include(%s)
2source/plugin/waterfall/waterfall.inc.php30waterFallMain->getMulPage(%d, %d, %d, %d, %d, %d)
3source/plugin/waterfall/main.class.php105discuz_database::fetch_first(%s)
4source/class/discuz/discuz_database.php94discuz_database::query(%s, Array, false, false)
5source/class/discuz/discuz_database.php142db_driver_mysqli->query(%s, false, false)
6source/class/db/db_driver_mysqli.php148db_driver_mysqli->halt(%s, %d, %s)
7source/class/db/db_driver_mysqli.php223break()
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