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', '3ncagjiahek8f639d8771q9lc2', '54.81.150.27', '1537449953', '1537449953', '/catalog/product_info.php?name=Mason%20Auto%20Emblem%20-%20MASON_REFLECTIVE&products_id=674')

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