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', 'fofnd5k2a01c1o52mikfor4405', '54.80.188.87', '1539999638', '1539999638', '/catalog/contact_us.php?osCsid=ii0mmnfbdt5n86f022rkbdjdl2')

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