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', '17oti6srt7l79mr99rbsrt45b7', '54.156.39.245', '1539610943', '1539610943', '/catalog/shipping.php?osCsid=6nkugtbpv3rck81in4amd2pe47')

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