Xamarin MysqlConnector weird NullReferenceException error

Question

I'm wanting to make a small and simple mobile app for a school project, I know connecting to a db from a phone is not good for security reasons but basically only I will touch it.

So to connect my Xamarin app to Mysql I downloaded the extension MysqlConnector (https://www.nuget.org/packages/MySqlConnector/2.1.8?_src=template)

Everything seemed to work at first, but now I think that there is a problem in their library that is not compatible with Xamarin:

I seem to always get a nullreference exception at the second query at line reader = cmd.ExecuteReader();. I don't know why, nothing is null, I've printed everything. (I've put a comment on the line where it happens) I seriously doubt it is a problem in their library since they have 37.2M downloads in total. But maybe it is just a compatability conflict, but that makes it odd that the first query works then.

Here is all my current code:

using PuppyChinoBestelling.Views;
using System;
using System.Collections.Generic;
using System.Text;
using Xamarin.Forms;
using MySqlConnector;
using System.Threading.Tasks;

namespace PuppyChinoBestelling.ViewModels
{
    public class LoginViewModel : BaseViewModel
    {
        public Command LoginCommand { get; }
        public string Mail { get; set; }
        public string Pass { get; set; }

        public LoginViewModel()
        {
            Pass = string.Empty;
            Mail = string.Empty;
            LoginCommand = new Command(OnLoginClicked);
        }

        
        private async void OnLoginClicked(object obj)
        {
            
            MySqlConnection conn = new MySqlConnection("private");

            try
            {
                conn.Open();
                Console.WriteLine("Conn opened!");
            }
            catch(Exception ex)
            {
                Console.WriteLine("Error " + ex.Message);
            }


            string sql = @"SELECT * FROM users WHERE email = @email;";
            var cmd = conn.CreateCommand();
            cmd.CommandText = sql;
            cmd.Parameters.AddWithValue("@email", Mail);

            var reader = cmd.ExecuteReader();

            if (reader.HasRows)
            {
                sql = @"SELECT * FROM users WHERE email = @email;";
                cmd = conn.CreateCommand();
                cmd.Parameters.Clear();
                cmd.CommandText = sql;
                cmd.Parameters.AddWithValue("@email", Mail);

                reader = cmd.ExecuteReader(); //null reference happening here idk why

                string pwdHashed = reader.GetString(5);

                bool validPwd = BCrypt.Net.BCrypt.Verify(Pass, pwdHashed);

                conn.Close();

                if (validPwd)
                {
                    await Shell.Current.GoToAsync($"//{nameof(AboutPage)}");
                }
                else
                {
                    Console.WriteLine("Foute logingegevens!");
                }
            }
            else
            {
                Console.WriteLine("Je bestaat niet!");
            }


        }



        
    }
}

Thanks in advance!