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', '837265436877f6be4f0fe6d3dc71ba9f', '34.239.151.124', '1718720278', '1718720278', '/product_info.php/info/p66_MET-Honigwein-0-75-l--de-Immenwaechter--lieblich-aus-Bluetenhonig.html')

[XT SQL Error]