diff --git a/DS4Windows/DS4Control/ControlService.cs b/DS4Windows/DS4Control/ControlService.cs
index 7a80d98..acd3bab 100644
--- a/DS4Windows/DS4Control/ControlService.cs
+++ b/DS4Windows/DS4Control/ControlService.cs
@@ -171,7 +171,16 @@ namespace DS4Windows
         public void ScanPurgeHidGuard()
         {
             RegistryKey tempkey = Registry.LocalMachine.OpenSubKey(@"SYSTEM\CurrentControlSet\Services\HidGuardian\Parameters\Whitelist");
-            string[] subkeys = tempkey.GetSubKeyNames();
+            string[] subkeys = null;
+            if (tempkey != null)
+            {
+                subkeys = tempkey.GetSubKeyNames();
+            }
+            else
+            {
+                subkeys = new string[0];
+            }
+
             bool processExists = false;
             for (int ind = 0, arlen = subkeys.Length; ind < arlen; ind++)
             {
diff --git a/DS4Windows/Properties/AssemblyInfo.cs b/DS4Windows/Properties/AssemblyInfo.cs
index b27f271..628a800 100644
--- a/DS4Windows/Properties/AssemblyInfo.cs
+++ b/DS4Windows/Properties/AssemblyInfo.cs
@@ -33,7 +33,7 @@ using System.Runtime.InteropServices;
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.4.121")]
-[assembly: AssemblyFileVersion("1.4.121")]
+[assembly: AssemblyVersion("1.4.123")]
+[assembly: AssemblyFileVersion("1.4.123")]
 [assembly: NeutralResourcesLanguage("en")]