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', 'm227lnoar0gem9nrv9dl6e6dl3', '54.198.15.20', '1540358387', '1540358387', '/catalog/product_info.php?products_id=620&osCsid=lu94nqe7a1geohpd2khjekp2s4')

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