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', 'dq48utmgv7b1vo0mdgd4qabkd5', '54.158.52.166', '1537364461', '1537364461', '/catalog/product_info.php?products_id=431&osCsid=fi3j8ufkg5ss99gu0oqi36m9v4')

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