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', '3jo9blehbahnsk2kph7u17na32', '216.73.216.29', '1769063887', '1769063887', '/product_info.php?info=p64_Dengelbengel.html')

[XT SQL Error]