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', 'cb27bcb065e562b81b9ea4ce7cee3a6d', '216.73.216.132', '1759471094', '1759471094', '/shop/product_info.php?info=p35_.html')

[XT SQL Error]