1366 - Incorrect integer value: '' for column `usr_web74_1`.`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', 'pp0mm1rcpmug7gv6f9dlnt73l7', '216.73.216.117', '1758258340', '1758258340', '/product_info.php?info=p1768_Einkaufskorb-L.html')

[XT SQL Error]