Getting "Access denied for user..." every 2nd hit

I'm trying to use dapper with mysql in .net core 1.0. I'm using this mysql connector: https://github.com/bgrainger/MySqlConnector

I know the connector is in alpha but I was wondering if anyone had a similar issue when using it together with dapper.

This is my simple model:

        public List<GeneralModel> GetAllLists()
        {
            try
            {
                using (DbConnection connection = new MySqlConnection("Server=localhost;Database=lists;Uid=Unnamed;Pwd=lol;"))
                {
                    return connection.Query<GeneralModel>("SELECT * FROM lists.general").ToList();
                }
            }
            catch (Exception)
            {
                throw;
            }
        }

And this is the controller:

    public IActionResult Index()
    {
        GeneralModel GenRepo = new GeneralModel();
        return View(GenRepo.GetAllLists());
    }

When I go to the index page for the first time, it works. If I refresh, I get an "Access denied for user...". I have no idea what could be causing the error. I don't think the problem is in my code.

Edit:

I guess the problem is in the connector, since this also returns the error after a refresh:

            List<GeneralModel> lists = new List<GeneralModel>();
            using (DbConnection connection = new MySqlConnection("Server=localhost;Database=lists;Uid=Unnamed;Pwd=lol;"))
            {
                using (DbCommand myCommand = connection.CreateCommand())
                {
                    myCommand.CommandText = "SELECT * FROM lists.general";

                    connection.Open();
                    using (DbDataReader myReader = myCommand.ExecuteReader())
                    {
                        while (myReader.Read())
                        {
                            GeneralModel tmpGen = new GeneralModel();
                            tmpGen.name = myReader["name"].ToString();
                            tmpGen.description = myReader["description"].ToString();
                            tmpGen.language = myReader["language "].ToString();

                            lists.Add(tmpGen);
                        }
                    }
                    connection.Close();
                }
            }
            return lists;