1366 - Incorrect integer value: '' for column `dbkh8z2q`.`whos_online`.`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', '752cc9347b8ddf0a07b7623b6f86e312588de0b3', '3.231.226.13', '1591472628', '1591472628', '/eshop/shopping_cart.php?XTCsid=59709a364b000bb8f57a27f6dd6a6b20')

[XT SQL Error]