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', 'q63be4eb8s15k84clc6b3ieh52', '18.97.9.171', '1747712515', '1747712515', '/product_info.php?info=p147_405700-Pfostentraeger-mit-Schwert--auf-Standfu---510-mm.html')

[XT SQL Error]