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', 'pu2a4ic9uidse0i9qjd24iqbq2', '216.73.216.53', '1751960127', '1751960127', '/product_info.php/info/p6341_Hydranten-Kennzeichnung-mit-Beispiel.html')

[XT SQL Error]