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', 'vockjf6lrq4eju1h7ncadt7b51', '54.198.212.30', '1539857674', '1539857674', '/catalog/product_notifications.php?osCsid=k8oq2kjcaf88lqj6bciitj7bh3')

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