trouble with link: get_order

@classmethod
    def get_order(self, id: int):
        base = sqlite3.connect('base.db')
        cursor = base.cursor()
        order = cursor.execute('select * from orders where id=?', (id,)).fetchall()
        if order:
            order = order[0]
            self.id = id
            self.user_id = order[1]
            self.owner_id = order[2]
            self.notif1 = order[3]
            self.notif2 = order[4]
            self.worker_id = order[5]
            base.close()
            return self
        else:
            base.close()
            return None