diff --git a/livesupport/src/products/gLiveSupport/src/GLiveSupport.cxx b/livesupport/src/products/gLiveSupport/src/GLiveSupport.cxx
index 924e55a9e..6384e53ec 100644
--- a/livesupport/src/products/gLiveSupport/src/GLiveSupport.cxx
+++ b/livesupport/src/products/gLiveSupport/src/GLiveSupport.cxx
@@ -799,8 +799,12 @@ GLiveSupport :: acquirePlayable(Ptr<const UniqueId>::Ref  id)
 
     } else if (existsAudioClip(id)) {
         playable = acquireAudioClip(id);
-    }
 
+    } else {
+        throw XmlRpcInvalidArgumentException(
+                                "invalid ID in GLiveSupport::acquirePlayable");
+    }
+    
     return playable;
 }