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', '75rcmn65e5i61g0m77v747hj61', '54.198.23.251', '1537415084', '1537415084', '/catalog/product_info.php?name=Daughter%20of%20Isis&products_id=158')

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