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', '6bc6e58caad13ed9ae34bf4479a289f7', '34.239.151.124', '1718723116', '1718723116', '/product_info.php/info/p14_Akazienhonig.html')

[XT SQL Error]