Try AdminDuty3

ReallifeGamemode.Server/Extensions/ClientExtension.cs

@@ -73,7 +73,7 @@ namespace ReallifeGamemode.Server.Extensions
     public static bool IsAdminDuty(this Player player)
     {
       var user = player.GetUser();
-      return user.GetData("Adminduty", false);
+      return user.GetData<bool>("duty");
     }
     public static Vector3 GetPositionFromPlayer(Player player, float distance, int offset = 0)
     {