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', 'aqe1aunftbed36qmugt5uj7fd5', '54.198.142.121', '1537922223', '1537922223', '/catalog/product_info.php?name=SGRho%20Poodle&products_id=161')

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