Zencart 1.5.7 fatal error

[Former user]

--> PHP Fatal error: 1062:Duplicate entry 'ADMIN_PAGES_CONTROL_VERSION' for key 'unq_config_key_zen' :: INSERT INTO configuration (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, last_modified, date_added, use_function, set_function) VALUES ('Version', 'ADMIN_PAGES_CONTROL_VERSION', '1.0.0', 'Version installed:', 59, 0, NOW(), NOW(), NULL, NULL); ==> (as called by) /var/sites/n/public_html/admin/includes/installers/admin_pages_control/1_0_0.php on line 17 <== in /var/sites/n/public_html/includes/classes/db/mysql/query_factory.php on line 170.