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', '831b604b6df2838a9c53ea218dc60867', '18.217.194.39', '1713452495', '1713452495', '/product_info.php/info/p20_Propolis-im-Honig.html')

[XT SQL Error]