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', '5el835n0dc9b3jcio9cbd44bh0', '54.80.87.166', '1540044161', '1540044161', '/catalog/product_info.php?products_id=472&osCsid=4939nmkfcrg4ng4hvtaaostvt3')

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