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', 'h7i36hp6rpea78s36c5fosful2', '54.224.247.42', '1540203392', '1540203392', '/catalog/product_info.php?name=Iota%20Phi%20Theta%20laser%20engraved%20Acrylic%20keychain%20AKLE&products_id=929')

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