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', 'c95ec6dc5fa140664376436ecb6c78fa', '3.145.143.239', '1714107889', '1714107889', '/product_info.php/info/p19_Waldhonig.html')

[XT SQL Error]