1366 - Incorrect integer value: '' for column `sql12320`.`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', '0ad8e672078e4c56b621b35440bec444', '3.83.188.254', '1585985841', '1585985841', '/shop/ifshop_content.php/coID/1/content/Liefer--und-Versandkosten')

[XT SQL Error]