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', '827c70047a2df5db9a5dbdee2f1bb6da', '3.237.34.21', '1709262360', '1709262360', '/product_info.php/info/p6_Sommerhonig-Linde.html')

[XT SQL Error]