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', 'c15knu0a6mhh8f7smqe7uhqvc4', '54.80.87.166', '1540038240', '1540038240', '/catalog/product_info.php?products_id=666&osCsid=tgj5p8qje33s4i6adtfv208as4')

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