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', '1o5q1sd7587fqbm5dcb0vhbno2', '54.161.100.24', '1539670520', '1539670520', '/catalog/product_info.php?products_id=691&osCsid=ii1tdmp54ss3ja9ah738m1qeo7')

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