Index: /trunk/src/VBox/Main/src-client/DrvAudioVideoRec.cpp
===================================================================
--- /trunk/src/VBox/Main/src-client/DrvAudioVideoRec.cpp	(revision 73539)
+++ /trunk/src/VBox/Main/src-client/DrvAudioVideoRec.cpp	(revision 73540)
@@ -571,4 +571,6 @@
     RT_NOREF(pThis, pStreamAV);
 
+    int rc;
+
     switch (enmStreamCmd)
     {
@@ -577,12 +579,14 @@
         case PDMAUDIOSTREAMCMD_RESUME:
         case PDMAUDIOSTREAMCMD_PAUSE:
+            rc = VINF_SUCCESS;
             break;
 
         default:
-            AssertMsgFailed(("Invalid command %ld\n", enmStreamCmd));
+            rc = VERR_NOT_SUPPORTED;
             break;
-    }
-
-    return VINF_SUCCESS;
+        }
+    }
+
+    return rc;
 }