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', 'j36acigtft1rb848njlindg353', '3.145.197.164', '1747139995', '1747139995', '/product_info.php?info=p649_802479-Edelstahlkanne-2-Liter.html')

[XT SQL Error]