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', '23u3kulo2ifmv6jbdqljh8fiq5', '54.162.133.222', '1539899691', '1539899691', '/catalog/default.php?osCsid=d3dh6tvlmg0jjepulfb1rvnjq3')

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