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', '3u6i6v942ns0ntbkj7o50fas42', '54.198.52.82', '1537831765', '1537831765', '/catalog/product_info.php?products_id=479&osCsid=98gmlsljt33rt1727osgke44l6')

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