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', '5kkdik6m6gq8flub7ic4hsp872', '54.156.51.193', '1537311387', '1537311387', '/catalog/product_info.php?name=AKA%20Traditional%20Paddle%20160&products_id=539')

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