If you use a tool like phpmyadmin to access the database you browse to the xf_poll table, and then add the field using the on screen controls. The field name is multiple. I would guess it's a tinyint field but that should really matter as long as it exists.
But I would add a tinyint field with a default value of 0 (zero.)
That should get through this one issue, but there will likely be more.
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