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', 'egpmsv7ficccrro118f9r9tr10', '216.73.216.141', '1751420055', '1751420055', '/index.php?cat=c5_Crockery.html&XTCsid=ee199fdb171da456469b100b0e4b3f11')

[XT SQL Error]