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', 'enqqjltnlsign78ji16qt8dao3', '54.198.55.167', '1540019280', '1540019280', '/catalog/default.php?cPath=29&osCsid=fbl9ifvmv7vtkvvcr8ei3doj81')

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