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', 'kpdjq0decdpjjrrtdoi8cl1ja0', '216.73.216.53', '1751963855', '1751963855', '/shop_content.php/coID/2/content/Datenschutzerklaerung')

[XT SQL Error]