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', '9554f8hfht9uv6l5md45t22sq1', '216.73.216.89', '1767059295', '1767059295', '/product_info.php?info=p147_405700-Pfostentraeger-Schwert-zum-Einbetonieren-Standfu-.html')

[XT SQL Error]