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', '5l6d5pajac8h7g4h4ipqqnthk7', '54.158.199.217', '1537893758', '1537893758', '/catalog/product_info.php?products_id=831&osCsid=77au6p05tpcd6aq65vrf4g6kq1')

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