SpigotCore_Main/src/de/steamwar/inventory/SWInventory.java

@@ -42,6 +42,7 @@ public class SWInventory implements Listener {
     final Player player;
     final Map<Integer, Consumer<InventoryClickEvent>> callbacks = new HashMap<>();
     final Inventory inventory;
+    boolean open = false;
 
     public SWInventory(Player p, int size, String t) {
         player = p;
@@ -127,11 +128,10 @@ public class SWInventory implements Listener {
 
     public void open() {
         player.openInventory(inventory);
-        Bukkit.getPluginManager().registerEvents(this, Core.getInstance());
-    }
-
-    public void reOpen() {
-        player.openInventory(inventory);
+        if(!open) {
+            Bukkit.getPluginManager().registerEvents(this, Core.getInstance());
+            open = true;
+        }
     }
 
     @EventHandler