diff --git a/BauSystem_20/src/de/steamwar/bausystem/features/simulator/preview/Simulator20.java b/BauSystem_20/src/de/steamwar/bausystem/features/simulator/preview/Simulator20.java
new file mode 100644
index 00000000..089674fd
--- /dev/null
+++ b/BauSystem_20/src/de/steamwar/bausystem/features/simulator/preview/Simulator20.java
@@ -0,0 +1,34 @@
+/*
+ *   This file is a part of the SteamWar software.
+ *
+ *   Copyright (C) 2023  SteamWar.de-Serverteam
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU Affero General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU Affero General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Affero General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package de.steamwar.bausystem.features.simulator.preview;
+
+import de.steamwar.bausystem.features.simulator.TNTData;
+import de.steamwar.bausystem.shared.Pair;
+
+import java.util.List;
+import java.util.Map;
+
+public class Simulator20 implements Simulator {
+
+    @Override
+    public PreviewRecord run(Pair<Integer, Map<Integer, List<List<Pair<TNTData, Integer>>>>> toCalculate) {
+        return null;
+    }
+}
diff --git a/BauSystem_Main/src/de/steamwar/bausystem/features/simulator/TNTSimulatorListener.java b/BauSystem_Main/src/de/steamwar/bausystem/features/simulator/TNTSimulatorListener.java
index 1d66457e..edeb0479 100644
--- a/BauSystem_Main/src/de/steamwar/bausystem/features/simulator/TNTSimulatorListener.java
+++ b/BauSystem_Main/src/de/steamwar/bausystem/features/simulator/TNTSimulatorListener.java
@@ -79,7 +79,10 @@ public class TNTSimulatorListener implements Listener {
         TNTSimulator tntSimulator = currentSimulator.remove(player);
         if (tntSimulator == simulator) return;
         if (tntSimulator != null) tntSimulator.hide(player);
-        if (simulator == null) return;
+        if (simulator == null) {
+            SimulatorCursor.hide(player);
+            return;
+        }
         currentSimulator.put(player, simulator);
         simulator.show(player);
         SimulatorCursor.show(player, simulator, trace(player, player.getLocation(), simulator));