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', 'j6vc8g4s1tisafa7ila92jmiq6', '54.198.55.167', '1539786796', '1539786796', '/catalog/checkout_confirmation.php?osCsid=ognb5n7d6jsi1jsvllql6g3mk2')

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