diff --git a/BauSystem_Main/src/de/steamwar/bausystem/world/ScriptListener.java b/BauSystem_Main/src/de/steamwar/bausystem/world/ScriptListener.java
index 60c3121..07cffe3 100644
--- a/BauSystem_Main/src/de/steamwar/bausystem/world/ScriptListener.java
+++ b/BauSystem_Main/src/de/steamwar/bausystem/world/ScriptListener.java
@@ -23,7 +23,7 @@ import de.steamwar.bausystem.BauSystem;
 import de.steamwar.bausystem.commands.CommandScript;
 import de.steamwar.bausystem.commands.CommandTNT;
 import de.steamwar.bausystem.tracer.record.RecordStateMachine;
-import de.steamwar.core.Core;
+import de.steamwar.core.VersionedCallable;
 import org.bukkit.Bukkit;
 import org.bukkit.ChatColor;
 import org.bukkit.entity.Player;
@@ -72,13 +72,8 @@ public class ScriptListener implements Listener {
     }
 
     private boolean isNoBook(ItemStack item){
-        switch(Core.getVersion()){
-            case 12:
-                return ScriptListener_12.isNoBook(item);
-            case 15:
-            default:
-                return ScriptListener_15.isNoBook(item);
-        }
+        return VersionedCallable.call(new VersionedCallable<>(() -> ScriptListener_12.isNoBook(item), 8),
+                new VersionedCallable<>(() -> ScriptListener_15.isNoBook(item), 15));
     }
 
     private static class ScriptExecutor {