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', '072ccf8a23008a8947b0d474b17c2ef5', '3.145.84.198', '1722063020', '1722063020', '/product_info.php/info/p69_Linde---Kornblume.html')

[XT SQL Error]