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', '51ok22bfsth0g5hastu62mhrr6', '54.161.100.24', '1539671281', '1539671281', '/catalog/checkout_confirmation.php?osCsid=499sa2lvkkcfb18jn6qh3c93a0')

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