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', '4e30mgsfui3cbvn8nionslren1', '216.73.216.196', '1752987671', '1752987671', '/index.php/cat/images/categories/5171.jpg')

[XT SQL Error]