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', 'u6c0cv0vkcc57ousl9qav20cl7', '54.158.208.189', '1540263148', '1540263148', '/catalog/product_info.php?products_id=908&osCsid=9rumv2h8ncjnnk4jirmr7aju45')

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