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', 'cfhf1ki5c5jdbaeaftq1bf0432', '54.198.15.20', '1540355395', '1540355395', '/catalog/default.php?cPath=52&osCsid=ueb6j0oh5mkkn7epurafo0kkr1')

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