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', 'r40bmv9ai87484srf97r9l8g16', '54.80.219.236', '1537452627', '1537452627', '/catalog/product_info.php?products_id=979&osCsid=ri50g9t88rd2ot1n73eboc65j3')

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