diff --git a/OpenSim/Region/CoreModules/Framework/UserManagement/UserManagementModule.cs b/OpenSim/Region/CoreModules/Framework/UserManagement/UserManagementModule.cs
index 9f0a7198ab..3455e2c956 100644
--- a/OpenSim/Region/CoreModules/Framework/UserManagement/UserManagementModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/UserManagement/UserManagementModule.cs
@@ -278,7 +278,8 @@ namespace OpenSim.Region.CoreModules.Framework.UserManagement
             {
                 foreach (UserData data in m_UserCache.Values)
                 {
-                    if (users.Find(delegate(UserData d) { return d.Id == data.Id; }) == null &&
+                    if (data.Id != UUID.Zero &&
+                        users.Find(delegate(UserData d) { return d.Id == data.Id; }) == null &&
                         (data.FirstName.ToLower().StartsWith(query.ToLower()) || data.LastName.ToLower().StartsWith(query.ToLower())))
                         users.Add(data);
                 }
@@ -725,4 +726,4 @@ namespace OpenSim.Region.CoreModules.Framework.UserManagement
 
     }
 
-}
\ No newline at end of file
+}