Index: /trunk/src/VBox/Devices/Audio/DrvAudio.cpp
===================================================================
--- /trunk/src/VBox/Devices/Audio/DrvAudio.cpp	(revision 61562)
+++ /trunk/src/VBox/Devices/Audio/DrvAudio.cpp	(revision 61563)
@@ -1270,9 +1270,15 @@
     if (RT_FAILURE(rc))
     {
-        drvAudioStreamDestroyInternal(pThis, pGstStrm);
-        pGstStrm = NULL;
-
-        drvAudioStreamDestroyInternal(pThis, pHstStrm);
-        pHstStrm = NULL;
+        if (pGstStrm)
+        {
+            drvAudioStreamDestroyInternal(pThis, pGstStrm);
+            pGstStrm = NULL;
+        }
+
+        if (pHstStrm)
+        {
+            drvAudioStreamDestroyInternal(pThis, pHstStrm);
+            pHstStrm = NULL;
+        }
     }
     else