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.php547discuz_cron::run()
4source/class/discuz/discuz_cron.php48include('C:\wwwroot ...')
5source/include/cron/cron_cleanup_daily.php19updatecache(Array)
6source/function/function_cache.php47call_user_func('build_cach ...')
7build_cache_setting()
8source/function/cache/cache_setting.php98table_common_usergroup->buyusergroup_exists()
9source/class/table/table_common_usergroup.php135discuz_database::result_first('SELECT COU ...', Array)
10source/class/discuz/discuz_database.php117discuz_database::query('SELECT COU ...', Array, false, false)
11source/class/discuz/discuz_database.php136db_driver_mysql->query('SELECT COU ...', false, false)
12source/class/db/db_driver_mysql.php153db_driver_mysql->halt('You have a ...', 1064, 'SELECT COU ...')
13source/class/db/db_driver_mysql.php224break()
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