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', '89dc1dcc3a0d9815315065dfda7f44f0', '3.139.90.131', '1714163823', '1714163823', '/product_info.php/info/p31_Bluetenpollen-im-Honig.html')

[XT SQL Error]