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', 'avmnnvmusnlf0t31j7k5ts4nt2', '54.161.71.87', '1537394732', '1537394732', '/catalog/shopping_cart.php?osCsid=93d2ucl1m1ggqhf3e5nbmtonj6')

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