1366 - Incorrect integer value: '' for column `abtecsho_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', 'ftv5tkcartat3p206791hli4h6', '216.73.216.19', '1770227468', '1770227468', '/shop_content.php/coID/101/product/Was-ist-KNS--')

[XT SQL Error]