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', 'duftr2mo3naoo61ehnvlkavie2', '54.162.118.107', '1539767258', '1539767258', '/catalog/product_info.php?products_id=479&osCsid=rta8pd3svfk5pfmf6qffqcov51')

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