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', '5dkh8e5f8po120c34lo3mpe3q4', '54.166.207.223', '1539819478', '1539819478', '/catalog/shopping_cart.php?osCsid=1rn2b869fduddk9jk3auqsm0d4')

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