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', 'crbsa9iq0s9g79sd6nnl2s0u26', '216.73.216.45', '1758178746', '1758178746', '/popup_content.php/coID/1')

[XT SQL Error]