diff --git a/src/de/steamwar/bungeecore/commands/BauCommand.java b/src/de/steamwar/bungeecore/commands/BauCommand.java
index 043ddfb3..b433f72f 100644
--- a/src/de/steamwar/bungeecore/commands/BauCommand.java
+++ b/src/de/steamwar/bungeecore/commands/BauCommand.java
@@ -229,8 +229,8 @@ public class BauCommand {
 
     private static void delete(ProxiedPlayer p, String[] command){
         SWInventory inventory = new SWInventory(p, 9, "§eWirklich Welt löschen?");
-        inventory.addItem(8, new SWItem(8, "§cAbbrechen", 1), click -> inventory.close());
-        inventory.addItem(1, new SWItem(1, "§aLöchen", 10), click -> {
+        inventory.addItem(new SWItem(8, "§cAbbrechen", 1), click -> inventory.close());
+        inventory.addItem(new SWItem(0, "§aLöschen", 10), click -> {
             if(bau15(p, command, 2)){
                 SteamwarUser user = SteamwarUser.get(p.getUniqueId());
                 deleteWorld(p, BungeeCore.USERWORLDS15 + user.getId());
diff --git a/src/de/steamwar/bungeecore/comms/handlers/InventoryCallbackHandler.java b/src/de/steamwar/bungeecore/comms/handlers/InventoryCallbackHandler.java
index e39b668b..07d37b72 100644
--- a/src/de/steamwar/bungeecore/comms/handlers/InventoryCallbackHandler.java
+++ b/src/de/steamwar/bungeecore/comms/handlers/InventoryCallbackHandler.java
@@ -20,10 +20,13 @@
 package de.steamwar.bungeecore.comms.handlers;
 
 import com.google.common.io.ByteArrayDataInput;
+import de.steamwar.bungeecore.BungeeCore;
 import de.steamwar.bungeecore.comms.SpigotHandler;
+import de.steamwar.bungeecore.comms.packets.CloseInventoryPacket;
 import de.steamwar.bungeecore.inventory.InvCallback;
 import de.steamwar.bungeecore.inventory.SWInventory;
 import de.steamwar.bungeecore.sql.SteamwarUser;
+import net.md_5.bungee.api.ProxyServer;
 
 import java.util.HashMap;
 import java.util.Map;
@@ -36,6 +39,13 @@ public class InventoryCallbackHandler implements SpigotHandler {
     public void handle(ByteArrayDataInput byteArrayDataInput) {
         SteamwarUser owner = SteamwarUser.get(byteArrayDataInput.readInt());
         CallbackType type = CallbackType.valueOf(byteArrayDataInput.readUTF());
+        if(!inventoryHashMap.containsKey(owner.getId())) {
+            BungeeCore.send(ProxyServer.getInstance().getPlayer(owner.getUuid()), BungeeCore.CHAT_PREFIX + "§cBitte erneut versuchen. Durch ein Softwareupdate konnte die übliche Aktion nicht durchgeführt werden.");
+            if(type == CallbackType.CLICK) {
+                new CloseInventoryPacket(owner.getId()).send(ProxyServer.getInstance().getPlayer(owner.getUuid()));
+            }
+            return;
+        }
         if(type == CallbackType.CLICK) {
             int pos = byteArrayDataInput.readInt();
             InvCallback.ClickType clickType = InvCallback.ClickType.valueOf(byteArrayDataInput.readUTF());
diff --git a/src/de/steamwar/bungeecore/comms/packets/CloseInventoryPacket.java b/src/de/steamwar/bungeecore/comms/packets/CloseInventoryPacket.java
index 974661ab..0445c104 100644
--- a/src/de/steamwar/bungeecore/comms/packets/CloseInventoryPacket.java
+++ b/src/de/steamwar/bungeecore/comms/packets/CloseInventoryPacket.java
@@ -22,24 +22,22 @@ package de.steamwar.bungeecore.comms.packets;
 import com.google.common.io.ByteArrayDataOutput;
 import de.steamwar.bungeecore.comms.BungeePacket;
 import de.steamwar.bungeecore.comms.PacketIdManager;
-import de.steamwar.bungeecore.sql.SteamwarUser;
-import net.md_5.bungee.api.connection.ProxiedPlayer;
 
 public class CloseInventoryPacket extends BungeePacket {
 
-    final ProxiedPlayer player;
+    final int player;
 
     @Override
     public int getId() {
         return PacketIdManager.INVENTORY_CLOSE_PACKET;
     }
 
-    public CloseInventoryPacket(ProxiedPlayer player) {
+    public CloseInventoryPacket(int player) {
         this.player = player;
     }
 
     @Override
     public void writeVars(ByteArrayDataOutput byteArrayDataOutput) {
-        byteArrayDataOutput.writeInt(SteamwarUser.get(player).getId());
+        byteArrayDataOutput.writeInt(player);
     }
 }
diff --git a/src/de/steamwar/bungeecore/inventory/SWInventory.java b/src/de/steamwar/bungeecore/inventory/SWInventory.java
index 6a308cff..1f3d1661 100644
--- a/src/de/steamwar/bungeecore/inventory/SWInventory.java
+++ b/src/de/steamwar/bungeecore/inventory/SWInventory.java
@@ -50,6 +50,11 @@ public class SWInventory {
         itemMap.put(item.getPosition(), item);
     }
 
+    public void addItem(SWItem item, InvCallback callback) {
+        item.setCallback(callback);
+        itemMap.put(item.getPosition(), item);
+    }
+
     public void addItem(int position, SWItem item) {
         itemMap.put(position, item);
     }
@@ -116,7 +121,7 @@ public class SWInventory {
     }
 
     public void close() {
-        new CloseInventoryPacket(player).send(player);
+        new CloseInventoryPacket(SteamwarUser.get(player).getId()).send(player);
     }
 
     public void setClose(InvCallback close) {