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', '2grcm3km4mb51f5dq0jd08hj11', '54.198.142.121', '1537922492', '1537922492', '/catalog/product_info.php?name=DST%20Graduation%20Stole%2098510%20red%20letters&products_id=830')

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