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', 'ssa67q2jhtd4702facl838l1p2', '54.196.26.1', '1539623478', '1539623478', '/catalog/product_info.php?products_id=981&osCsid=54dj5ekq0693l2ruhoamo3ati2')

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