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', 'i67rj8k1heflo9o5qr805f3on6', '54.156.39.245', '1540216183', '1540216183', '/catalog/product_notifications.php?osCsid=ioi3b8256ajsjgqeims2s7as62')

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