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', 'vfk95fer808otlpn9p60u57sh3', '54.145.83.79', '1539694123', '1539694123', '/catalog/shopping_cart.php?osCsid=65f07ms35to1j1036qk1srf7q0')

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