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', '9ff0n998eb6ld0u01qvp5sisq1', '54.92.163.105', '1540280056', '1540280056', '/catalog/product_info.php?products_id=708&osCsid=rbh0s4neo966nhku2a7st2nlp4')

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