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', 'uuh5d0ko9ehgrusmob91bbd8q6', '54.166.203.17', '1537319523', '1537319523', '/catalog/default.php?osCsid=f0t67sq66l01hup6n8bcfu9g64')

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