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', '4dc9b67af336b83228652a1f27975feb', '3.148.102.90', '1714028316', '1714028316', '/product_info.php/info/p24_Kornblumenhonig.html')

[XT SQL Error]