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', 'v0cfa597dhe58iv2cfu3jhc194', '54.224.247.42', '1540201726', '1540201726', '/catalog/product_info.php?name=Eastern%20Star%20License%20Plate%20-%20OES_DMTS&products_id=684')

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