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', '6ju88dovd0d6bn44t1tpaqh9o2', '54.158.199.217', '1537894175', '1537894175', '/catalog/product_info.php?name=DST%20Torch&products_id=150')

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