1366 - Incorrect integer value: '' for column `mapshopatlogis`.`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', '233403f47cd9cfc6e7d91a637af7b01d', '216.73.216.198', '1752879736', '1752879736', '/shop_content.php/language/de/coID/25/content/Rueckgaberecht')

[XT SQL Error]