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', '51fa1feb8c2f9630a750a7c2dd71e8e7', '216.73.216.134', '1758346895', '1758346895', '/index.php/language/de/cat/c37_Welt.html')

[XT SQL Error]