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', '4vfuf1tcj1kgd1q46eioecc2p2', '54.198.15.20', '1540355391', '1540355391', '/catalog/product_info.php?products_id=150&osCsid=jfumef7n3mie0bcc1700v0poe0')

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