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', 'hih1ih9q28kr18npu3ma78cdp2', '54.156.51.193', '1537343025', '1537343025', '/catalog/product_notifications.php?osCsid=i47api1qfu6ae3t960otbjhgk5')

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