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', '6gmkcnep3osji0lq7i3vkkhva0', '54.158.199.217', '1537280721', '1537280721', '/catalog/product_info.php?products_id=528&osCsid=93d2ucl1m1ggqhf3e5nbmtonj6')

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