diff --git a/Casino/Audioplayer.cs b/Casino/Audioplayer.cs
index ce70285..036e91f 100644
--- a/Casino/Audioplayer.cs
+++ b/Casino/Audioplayer.cs
@@ -38,9 +38,32 @@ namespace Casino
 
         public void PlayLoopingSound(byte[] audioBlob)
         {
+            
             string tempFile = System.IO.Path.Combine(
                 System.IO.Path.GetTempPath(),
-                "background.mp3");
+                "Hintergrundmusik.mp3");
+
+            player.Volume = 0.1;
+
+            File.WriteAllBytes(tempFile, audioBlob);
+
+            player.Open(new Uri(tempFile));
+
+            player.MediaEnded -= Player_MediaEnded;
+            player.MediaEnded += Player_MediaEnded;
+
+            player.Play();
+        }
+
+
+        public void PlayLoopingSound_2(byte[] audioBlob)
+        {
+
+            string tempFile = System.IO.Path.Combine(
+                System.IO.Path.GetTempPath(),
+                "Hintergrundmusik_Bus.mp3");
+
+            player.Volume = 0.1;
 
             File.WriteAllBytes(tempFile, audioBlob);
 
diff --git a/Casino/Busfahrer.xaml.cs b/Casino/Busfahrer.xaml.cs
index 4399f75..87b5afa 100644
--- a/Casino/Busfahrer.xaml.cs
+++ b/Casino/Busfahrer.xaml.cs
@@ -78,14 +78,13 @@ namespace Casino
         private List<Card> deck = new List<Card>();
         private List<Card> handCards = new List<Card>();
         private ImageSource cardBackImage = null!;
+        Audioplayer music = new Audioplayer();
 
         private int currentPhase = 0;
         private decimal currentBet = 0;
         private decimal currentProfit = 0;
         private bool roundRunning = false;
 
-        private static readonly Regex NumberRegex = new Regex("^[0-9]+$");
-
         public Busfahrer()
         {
             InitializeComponent();
@@ -94,6 +93,7 @@ namespace Casino
             UpdateAccountDisplay();
 
             ShowWaitingState();
+            music.PlayLoopingSound_2(db.GetSound(20));
         }
 
         private User CurrentUser => users[MainWindow.currentUser];
@@ -157,25 +157,38 @@ namespace Casino
 
         private void StartRound()
         {
-            if (currentBet <= 0 || currentBet > CurrentUser.Geld)
+            try
             {
-                ShowWaitingState();
-                return;
+                if (currentBet <= 0 || currentBet > CurrentUser.Geld)
+                {
+                    ShowWaitingState();
+                    return;
+                }
+
+                // Einsatz vom Konto abziehen
+                CurrentUser.Geld -= Convert.ToInt32(currentBet);
+                SaveAccount();
+
+                currentProfit = 0;
+                currentPhase = 0;
+                roundRunning = true;
+                TxtBet.IsEnabled = false;
+
+                LoadCards();
+                UpdateHandUI();
+                UpdateWinDisplay();
+                SetPhaseUI();
+            }
+            catch (NullReferenceException)
+            {
+                MessageBox.Show(
+                    "Bitte ein Betrag eingeben",
+                    "Fehlermeldung 101",
+                    MessageBoxButton.OK,
+                    MessageBoxImage.Information);
             }
 
-            // Einsatz vom Konto abziehen
-            CurrentUser.Geld -= Convert.ToInt32(currentBet);
-            SaveAccount();
-
-            currentProfit = 0;
-            currentPhase = 0;
-            roundRunning = true;
-            TxtBet.IsEnabled = false;
-
-            LoadCards();
-            UpdateHandUI();
-            UpdateWinDisplay();
-            SetPhaseUI();
+            
         }
 
         private void LoadCards()
@@ -553,6 +566,7 @@ namespace Casino
 
         private void Hauptmenue(object sender, RoutedEventArgs e)
         {
+            music.Stop();
             Close();
         }
 
@@ -580,6 +594,9 @@ namespace Casino
         // EINSATZ VALIDIERUNG
         // =========================
 
+
+        private static readonly Regex NumberRegex = new Regex("^[0-9]+$");
+
         private void TxtBet_PreviewTextInput(object sender, TextCompositionEventArgs e)
         {
             e.Handled = !NumberRegex.IsMatch(e.Text);
diff --git a/Casino/Slots.xaml.cs b/Casino/Slots.xaml.cs
index a2e73d7..fcd158f 100644
--- a/Casino/Slots.xaml.cs
+++ b/Casino/Slots.xaml.cs
@@ -131,15 +131,27 @@ namespace Casino
 
         private async void Spin(object sender, RoutedEventArgs e)
         {
-            int einsatz = Convert.ToInt32(einsatzFeld.Text);
-            users[MainWindow.currentUser].Geld-=einsatz;
-            Konto.Text = users[MainWindow.currentUser].Geld.ToString();
-            await Spin();
-            users[MainWindow.currentUser].Geld += CheckWin(currentSlot,einsatz);
-            Konto.Text = users[MainWindow.currentUser].Geld.ToString();
-            db.UpdateGeld(
-            users[MainWindow.currentUser].ID,
-            users[MainWindow.currentUser].Geld);
+           
+
+                int einsatz = Convert.ToInt32(einsatzFeld.Text);
+                users[MainWindow.currentUser].Geld -= einsatz;
+                Konto.Text = users[MainWindow.currentUser].Geld.ToString();
+                await Spin();
+                users[MainWindow.currentUser].Geld += CheckWin(currentSlot, einsatz);
+                Konto.Text = users[MainWindow.currentUser].Geld.ToString();
+                db.UpdateGeld(
+                    users[MainWindow.currentUser].ID, 
+                    users[MainWindow.currentUser].Geld);
+            
+           /* catch (NullReferenceException)
+            {
+                MessageBox.Show(
+                    "Bitte ein Betrag eingeben",
+                    "Fehlermeldung 101",
+                    MessageBoxButton.OK,
+                    MessageBoxImage.Information);
+            }*/
+
         }
 
         private void Hauptmenue(object sender, RoutedEventArgs e)