1366 - Incorrect integer value: '' for column `hbl_shop`.`whos_online`.`customer_id` at row 1

insert into whos_online (customer_id, full_name, session_id, ip_address, time_entry, time_last_click, last_page_url) values ('', 'Guest', 'fgr6v62e742dg6de6r9rp86ll0', '216.73.216.217', '1751516872', '1751516872', '/product_info.php?info=p598_804749-Saeschar-fuer-Einradhacke--3-St--.html')

[XT SQL Error]