diff --git a/Vocaluxe/Lib/Sound/CPortAudioHandle.cs b/Vocaluxe/Lib/Sound/CPortAudioHandle.cs
index a8fe8e89..d8ce237e 100644
--- a/Vocaluxe/Lib/Sound/CPortAudioHandle.cs
+++ b/Vocaluxe/Lib/Sound/CPortAudioHandle.cs
@@ -176,6 +176,11 @@ namespace Vocaluxe.Lib.Sound
 
                 try
                 {
+                    if (stream == IntPtr.Zero)
+                    {
+                         CLog.Debug("Stream is null, skipping close.");
+                         return;
+                    }
                     PortAudio.Pa_CloseStream(stream);
                 }
                 catch (Exception ex)
@@ -235,4 +240,4 @@ namespace Vocaluxe.Lib.Sound
             return selectedHostApi;
         }
     }
-}
\ No newline at end of file
+}