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', '6c8d2dkmcsm1pcim8cmcvuvaa6', '54.225.26.44', '1539866343', '1539866343', '/catalog/checkout_confirmation.php?osCsid=rgco69d72v37m43anv5mvpmqn5')

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