1366 - Incorrect integer value: '' for column `dogsdream`.`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', '8cc3adaa46afb4d089c5e6c7fc1d909a', '216.73.216.162', '1755325661', '1755325661', '/shop/index.php/cat/c4_Tierisch-gut.html')

[XT SQL Error]