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', 'l80t4cd9d4ru81fldsvm0jae22', '54.156.51.193', '1537312926', '1537312926', '/catalog/product_info.php?name=KAY%20Graduation%20Stole%2098424%20black%20letters&products_id=838')

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