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', '8b83aa9051bb692e71c82d293d85858e', '3.144.212.145', '1713952775', '1713952775', '/index.php')

[XT SQL Error]