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', 'qmrd9h8oggni8g33vsm02jd8k3', '54.158.208.189', '1539713393', '1539713393', '/catalog/shopping_cart.php?osCsid=nc6jcr8g9uualrc3vak2nm0m93')

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