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', '7384e907d52450b370c1aedd62d85d7b', '34.229.24.100', '1563485504', '1563485504', '/password_double_opt.php/language/en')

[XT SQL Error]