1366 - Incorrect integer value: '' for column `hbl_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', '8e4j7o6t4aoiubmoubm9mdkof5', '216.73.216.30', '1751594756', '1751594756', '/product_info.php?info=p37_Elektrische-Schrotmuehle.html')

[XT SQL Error]