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', 'e66i5arm8q0j143cgb31dl92d7', '54.198.212.30', '1539880590', '1539880590', '/catalog/product_info.php?products_id=830&osCsid=7cntok6n9ib5gtm85etkquaqr4')

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