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', 'o56fi53suen5md6vvl2r97ugp0', '216.73.216.71', '1752614144', '1752614144', '/shopping_cart.php')

[XT SQL Error]