diff --git a/BauSystem_Main/src/de/steamwar/bausystem/world/Detonator.java b/BauSystem_Main/src/de/steamwar/bausystem/world/Detonator.java
index 955f556..b96c414 100644
--- a/BauSystem_Main/src/de/steamwar/bausystem/world/Detonator.java
+++ b/BauSystem_Main/src/de/steamwar/bausystem/world/Detonator.java
@@ -81,7 +81,12 @@ public class Detonator implements Listener {
             Boolean powered;
             if(activation.activation == -1) switch (Core.getVersion()) {
                 case 15:
-                    powered = AutoLoader_15.getLever(activation.location.getBlock());
+                    try {
+                        powered = AutoLoader_15.getLever(activation.location.getBlock());
+                    }catch (ClassCastException e) {
+                        locs.remove(activation);
+                        return;
+                    }
                     AutoLoader_15.setRedstone(activation.location, !powered);
                     break;
                 default:
@@ -111,7 +116,7 @@ public class Detonator implements Listener {
             event.setCancelled(true);
             switch (event.getAction()) {
                 case LEFT_CLICK_BLOCK:
-                    Detoloader detoloader = null;
+                    Detoloader detoloader;
                     switch(Core.getVersion()){
                         case 15:
                             detoloader = AutoLoader_15.onPlayerInteractLoader(event);