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', '7a5vidm72661d608rk6hb72kl6', '54.224.118.247', '1540188729', '1540188729', '/catalog/default.php?cPath=48_256&osCsid=d3dh6tvlmg0jjepulfb1rvnjq3')

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