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', 'fb4fefc290d389c5b21ba327fd491cc0', '3.238.130.41', '1711704675', '1711704675', '/product_info.php/info/p70_Linde---Klee.html')

[XT SQL Error]