FB LogIn returning Null name iOS Swift

Hey guys! Thanks for this great platform.

Im implementing FB login through your tutorial using FB SDK. It´s “working” but the user being returned has name = “<null>”; Therefore when I try to access it I get a nil object.
When I directly print it from the FB I get: name = “An\U00edbal Alejandro Madrid”;
My name is Aníbal Alejandro Madrid. I guess the í could be messing it up?
This is the field mapping im using:

let fieldsMapping = [

            "id" : "facebookId",

            "name" : "name",

            "birthday": "birthday",

            "first_name": "fb_first_name",

            "last_name" : "fb_last_name",

            "gender": "gender",

            "email": "email"

        ]