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', 'buev4l44qe20nhiac10shjp2n5', '216.73.216.16', '1758219252', '1758219252', '/product_info.php?info=p1913_Trommeltasche-mittel.html')

[XT SQL Error]