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.php57discuz_application->init()
2source/class/discuz/discuz_application.php70discuz_application->_init_cron()
3source/class/discuz/discuz_application.php550discuz_cron::run()
4source/class/discuz/discuz_cron.php48include(%s)
5source/include/cron/cron_member_optimize_daily.php13table_common_member->split()
6source/class/table/table_common_member.php358table_common_member->switch_keys()
7source/class/table/table_common_member.php414updatecache()
8source/function/function_cache.php47build_cache_setting()
9source/function/cache/cache_setting.php98table_common_usergroup->buyusergroup_exists()
10source/class/table/table_common_usergroup.php135discuz_database::result_first()
11source/class/discuz/discuz_database.php118discuz_database::query()
12source/class/discuz/discuz_database.php137db_driver_mysqli->query()
13source/class/db/db_driver_mysqli.php147db_driver_mysqli->halt()
14source/class/db/db_driver_mysqli.php222break()
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