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', 'f9jjhc60qkpba5t8fjml3da7u7', '54.225.26.44', '1539774937', '1539774937', '/catalog/product_info.php?products_id=688&osCsid=mpf5rs1o6rdvmnf89i844k9u07')

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