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', 'e12299679292d47564ca9b3ab5b83d33', '34.229.24.100', '1563487599', '1563487599', '/index.php/cat/c18_Tom-Tailor.html')

[XT SQL Error]