1366 - Incorrect integer value: '' for column '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', '77494091440acd9e89bc7328c772d974', '3.137.192.3', '1714087190', '1714087190', '/product_info.php/info/p65_Baerenfang-0-35-l.html')

[XT SQL Error]