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', '15f3e3b26ddfd016f19c4c380695c989', '3.12.161.151', '1732272773', '1732272773', '/shop/product_info.php/info/p5_BIO---Korianderherzchen.html')

[XT SQL Error]