BauSystem_15/src/de/steamwar/bausystem/commands/CommandDebugStick_15.java

@@ -28,8 +28,8 @@ class CommandDebugStick_15 {
 
     static void giveStick(Player player){
         if(player.getInventory().getItemInMainHand().getType() == Material.AIR)
-            player.getInventory().setItemInMainHand(new ItemStack(Material.DEBUG_STICK, 1));
+            player.getInventory().setItemInMainHand(new ItemStack(Material.DEBUG_STICK));
         else
-            player.getInventory().setItemInOffHand(new ItemStack(Material.DEBUG_STICK, 1));
+            player.getInventory().addItem(new ItemStack(Material.DEBUG_STICK));
     }
 }

BauSystem_Main/src/de/steamwar/bausystem/commands/CommandDetonator.java

@@ -66,7 +66,7 @@ public class CommandDetonator implements CommandExecutor {
                 if(player.getInventory().getItemInMainHand().getType() == Material.AIR)
                     player.getInventory().setItemInMainHand(Detonator.WAND);
                 else
-                    player.getInventory().setItemInOffHand(Detonator.WAND);
+                    player.getInventory().addItem(Detonator.WAND);
                 player.updateInventory();
                 Detonator.getDetonator(player);
                 break;

BauSystem_Main/src/de/steamwar/bausystem/commands/CommandGUI.java

@@ -5,6 +5,7 @@ import de.steamwar.bausystem.Permission;
 import de.steamwar.bausystem.tracer.record.RecordStateMachine;
 import de.steamwar.bausystem.tracer.show.TraceShowManager;
 import de.steamwar.bausystem.world.*;
+import de.steamwar.core.Core;
 import de.steamwar.inventory.SWAnvilInv;
 import de.steamwar.inventory.SWInventory;
 import de.steamwar.inventory.SWItem;
@@ -84,7 +85,7 @@ public class CommandGUI implements CommandExecutor, Listener {
             player.closeInventory();
             player.performCommand("/wand");
         });
-        inv.setItem(41, Material.DEBUG_STICK, "§7Debugstick", Arrays.asList("§8/§7debugstick"), false, clickType -> {
+        inv.setItem(41, getMaterial("DEBUG_STICK", "STICK"), "§7Debugstick", Arrays.asList("§8/§7debugstick"), Core.getVersion() < 13,clickType -> {
             player.closeInventory();
             player.performCommand("debugstick");
         });

BauSystem_Main/src/de/steamwar/bausystem/commands/CommandSkull.java

@@ -50,7 +50,7 @@ public class CommandSkull implements CommandExecutor {
         if(p.getInventory().getItemInMainHand().getType() == Material.AIR)
             p.getInventory().setItemInMainHand(is);
         else
-            p.getInventory().setItemInOffHand(is);
+            p.getInventory().addItem(is);
         return false;
     }
 }