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', 'md1m9icn6jt8bmh39kkfc7rnc1', '54.225.26.44', '1539861282', '1539861282', '/catalog/checkout_confirmation.php?osCsid=k4uj25d2u1l6iii5k2hbgab1o2')

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