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', '68ue8l8hhg9aod8jnv79rjo9t2', '54.198.52.82', '1537747957', '1537747957', '/catalog/product_info.php?name=Traditional%20Greek%20Paddles&products_id=856')

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