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', '2h7d9f23kp1u0asjg41856l3o5', '3.140.195.167', '1746787702', '1746787702', '/product_info.php?info=p532_801090-Zweizylinder-Handpumpe--Landsberg-.html')

[XT SQL Error]