1366 - Incorrect integer value: '' for column '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', 'dee7497b6c3fbb34258798d2c676c2e6', '3.138.170.21', '1722090746', '1722090746', '/product_info.php/info/p73_Obstbluete---Akazienhonig.html')

[XT SQL Error]