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', 'tipf1i0k1ncpr1ptc1idvahsb0', '54.198.212.30', '1539599218', '1539599218', '/catalog/product_info.php?products_id=152&osCsid=f7sqvf13a0ef4untpn2vb5h2a1')

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