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', 'mfkfvr9mnd7t5tjr8rrmj5thm1', '54.80.58.121', '1537886559', '1537886559', '/catalog/products_new.php?osCsid=eabkkve8l4ecskateuitr61v45')

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