src/de/steamwar/lobby/listener/TeleporterListener.java

@@ -56,7 +56,7 @@ public class TeleporterListener extends BasicListener{
         player.openInventory(inventory);
     }
 
-    @EventHandler(priority = EventPriority.HIGH)
+    @EventHandler
     public void handlePlayerInventoryInteract(InventoryClickEvent event) {
         Player player = (Player) event.getWhoClicked();
         ItemStack item = event.getCurrentItem();
@@ -64,6 +64,8 @@ public class TeleporterListener extends BasicListener{
         if(item == null)
             return;
 
+        if(event.getClickedInventory().getContents() != inventory.getContents()) return;
+
         if(item.getType() == Material.MAGMA_CREAM) {
             player.teleport(spawn);
         }else if(item.getType() == Material.BEACON) {