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', 't4l1phrcvvc0dics0h8iqn3ja5', '216.73.216.53', '1751957733', '1751957733', '/index.php/cat/c_.html')

[XT SQL Error]