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', 'b514562576fe95f943742607b92bb9e9', '44.204.217.37', '1711691078', '1711691078', '/product_info.php/info/p15_Kornblume-Bluetenhonig.html')

[XT SQL Error]