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', '9ee7f839e17b1193e7246f98c7e37ec0', '18.188.229.120', '1722087804', '1722087804', '/product_info.php/info/p11_Lindenhonig.html')

[XT SQL Error]