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', 'lrjn9chsnnfsfq92pvfoa8j5k0', '54.198.55.167', '1540015488', '1540015488', '/catalog/product_info.php?cPath=52_188&products_id=768&osCsid=o3glspb3tt85gm640j9b5ipda0')

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