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', 'eko7omqksuioc24g9ivirs1hr2', '216.73.216.200', '1752881055', '1752881055', '/index.php/cat/c_.html')

[XT SQL Error]