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', 'b9kjptq6jfc59j9s65hlhms662', '54.224.166.141', '1537654571', '1537654571', '/catalog/shipping.php?osCsid=9rrm7krdqon5m34tmh1sd927t6')

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