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', '2hjidq5jlc0m974cjedea178m6', '216.73.216.181', '1752116288', '1752116288', '/index.php/cat/c5237_Fettbrand.html')

[XT SQL Error]