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', '1d143d8be7a8cd6836d42a1eb6687c82', '34.229.24.100', '1563488106', '1563488106', '/index.php/language/en/cat/c188_HOM-Shirts.html')

[XT SQL Error]