diff --git a/BauSystem_Main/src/de/steamwar/bausystem/features/simulator/tnt/TNTGroup.java b/BauSystem_Main/src/de/steamwar/bausystem/features/simulator/tnt/TNTGroup.java
index fddf63ad..38a990e8 100644
--- a/BauSystem_Main/src/de/steamwar/bausystem/features/simulator/tnt/TNTGroup.java
+++ b/BauSystem_Main/src/de/steamwar/bausystem/features/simulator/tnt/TNTGroup.java
@@ -139,6 +139,8 @@ public class TNTGroup implements SimulatorElement {
     }
 
     public void setTickOffset(int tickOffset) {
+        if (tickOffset < 0) tickOffset = 0;
+        if (tickOffset > 400) tickOffset = 400;
         this.tickOffset = tickOffset;
     }