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', 'ctvdulfjl7jv6hudokgpnl9rs5', '54.80.83.123', '1537524634', '1537524634', '/catalog/product_info.php?products_id=144&osCsid=rgco69d72v37m43anv5mvpmqn5')

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