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', 'd0f8v4nv610pvhj2m8cjlb9mo1', '54.224.56.126', '1539889548', '1539889548', '/catalog/product_info.php?products_id=789&osCsid=oqajt8bgtfvgbobrb8p4sjoa14')

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