Fixed Issue 415.

Author: moellerm

Properties/AssemblyVersion.cs

@@ -10,5 +10,5 @@ This Source Code Form is subject to the terms of the Mozilla Public
 
 using System.Reflection;
 
-[assembly: AssemblyVersion("0.5.1.9")]
-[assembly: AssemblyInformationalVersion("0.5.1.9 Alpha")]
+[assembly: AssemblyVersion("0.5.1.10")]
+[assembly: AssemblyInformationalVersion("0.5.1.10 Alpha")]

WMI/WmiProvider.cs

@@ -5,7 +5,8 @@ This Source Code Form is subject to the terms of the Mozilla Public
   file, You can obtain one at http://mozilla.org/MPL/2.0/.
  
   Copyright (C) 2009-2010 Paul Werelds <[email protected]>
-	
+	Copyright (C) 2012 Michael Möller <[email protected]>
+
 */
 
 using System;
@@ -102,6 +103,9 @@ private void RevokeInstance(string identifier) {
         item => item.Identifier == identifier.ToString()
       );
 
+      if (instanceIndex == -1)
+        return;
+
       try {
         Instrumentation.Revoke(activeInstances[instanceIndex]);
       } catch (Exception) { }