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', 'vkk4c4dlv3ch5oip2g48vmgn53', '54.161.71.87', '1537900668', '1537900668', '/catalog/product_info.php?products_id=431&osCsid=0plbhteppdnobjunroa1ikmj22')

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