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', 'u9fkvb3gklb6nd6covhd5u9q15', '54.166.203.17', '1537466338', '1537466338', '/catalog/checkout_confirmation.php?osCsid=fi3q87k6gumoh4s3gu3insgm92')

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