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', 'd3sur81aqhfhdc3o94fu02rc30', '54.198.205.153', '1537759113', '1537759113', '/catalog/product_info.php?products_id=535&osCsid=9rrm7krdqon5m34tmh1sd927t6')

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