1366 - Incorrect integer value: '' for column `abtecsho_shop`.`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', 'pr3j3cj4qhg7r42ut9cgnpg912', '216.73.216.157', '1760695074', '1760695074', '/shopping_cart.php')

[XT SQL Error]