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', '0lhr7o7g1mt32cbfr1h0504vi1', '54.158.208.189', '1540264055', '1540264055', '/catalog/product_info.php?products_id=855&osCsid=9mtneh2b3d9ng3123herhddps0')

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