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', '574358621f9d1adf24e204c58d04ec28', '216.73.216.145', '1760596409', '1760596409', '/index.php/language/de/cat/c43_Hoehendaten.html')

[XT SQL Error]