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', 'lc33bs9p7m2jlvfnd1i89p39f7', '54.80.87.166', '1539619385', '1539619385', '/catalog/default.php?cPath=50_141&osCsid=77au6p05tpcd6aq65vrf4g6kq1')

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