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 'system>0' at line 1
SELECT COUNT(*) FROM common_usergroup WHERE type='special' and system>0

PHP Debug

No.FileLineCode
1forum.php56discuz_application->init()
2source/class/discuz/discuz_application.php70discuz_application->_init_cron()
3source/class/discuz/discuz_application.php545discuz_cron::run()
4source/class/discuz/discuz_cron.php48include(%s)
5source/include/cron/cron_cleanup_daily.php19updatecache(Array)
6source/function/function_cache.php47build_cache_setting()
7source/function/cache/cache_setting.php98table_common_usergroup->buyusergroup_exists()
8source/class/table/table_common_usergroup.php135discuz_database::result_first(%s, Array)
9source/class/discuz/discuz_database.php118discuz_database::query(%s, Array, false, false)
10source/class/discuz/discuz_database.php137db_driver_mysqli->query(%s, false, false)
11source/class/db/db_driver_mysqli.php147db_driver_mysqli->halt(%s, %d, %s)
12source/class/db/db_driver_mysqli.php222break()
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