BauSystem_Main/src/de/steamwar/bausystem/world/AutoLoader.java

@@ -160,6 +160,8 @@ public class AutoLoader extends IAutoLoader implements Listener {
             return;
         if (event.getClickedBlock().getBlockData().getMaterial() == Material.OBSERVER)
             return;
+        if (event.getPlayer().isSneaking())
+            return;
 
         if(!setup || !event.getPlayer().equals(player))
             return;