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', 'pl1lkn6u5toh7qdta6l1kgqv45', '54.224.118.247', '1540189634', '1540189634', '/catalog/product_info.php?products_id=982&osCsid=i47api1qfu6ae3t960otbjhgk5')

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