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', 'ncustt4p9frl27pek96kn35rn7', '54.198.55.167', '1539757589', '1539757589', '/catalog/default.php?cPath=50_133&osCsid=rc3qog552hg5atl4j0knam8ol1')

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