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', 'gtitlsp1vs5a1o5271gr1koja5', '54.166.203.17', '1537675416', '1537675416', '/catalog/product_info.php?products_id=431&osCsid=3m16bmk644itpolc5gh7unuio1')

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