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', 'pfvbrh9j2lu4f5u3qsefv1qmg4', '54.80.219.236', '1537300389', '1537300389', '/catalog/product_notifications.php?osCsid=rtongck3tqjvt90d5hp2pljkb2')

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