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 '20:51:01 LIMIT 1000' at line 1
DELETE FROM plugin_guests WHERE ctime<2014-05-27 20:51:01 LIMIT 1000

PHP Debug

No.FileLineCode
1home.php41require_once(%s)
2source/module/home/home_space.php62require_once(%s)
3source/module/home/home_follow.php14showmessage()
4source/function/function_core.php1416dshowmessage(%s, %s)
5source/function/function_message.php239include(%s)
6data/template/34_19_common_showmessage.tpl.php1hookscriptoutput()
7source/function/function_core.php1204hookscript()
8source/function/function_core.php1167plugin_guests->global_footer(Array)
9source/plugin/guests/guests.class.php48plugin_guests->_clear_ip()
10source/plugin/guests/guests.class.php111discuz_database::delete(%s, %s, %d)
11source/class/discuz/discuz_database.php48discuz_database::query(%s, %s)
12source/class/discuz/discuz_database.php136db_driver_mysql->query(%s, false, true)
13source/class/db/db_driver_mysql.php153db_driver_mysql->halt(%s, %d, %s)
14source/class/db/db_driver_mysql.php224break()
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