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', '0cs1jd41l6sk7sd518ptvbej80', '54.198.15.20', '1540359030', '1540359030', '/catalog/shopping_cart.php?osCsid=r0j6phm8vhjbs4qfsn6548l632')

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