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', '5fc60panamug50bje4kohhs8i2', '54.158.208.189', '1539629517', '1539629517', '/catalog/product_info.php?products_id=146&osCsid=35hv2ec3cpnbhu6950vej9fvo3')

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