Resolve Regional ConcurrentModificationException

src/main/java/com/artillexstudios/axinventoryrestore/commands/subcommands/View.java

@@ -23,9 +23,8 @@ public void execute(Player sender, String player) {
             if (uuid == null) return;
 
             String name = Bukkit.getOfflinePlayer(uuid).getName();
-            Scheduler.get().runAt(sender.getLocation(), t -> {
-                new MainGui(uuid, sender, Optional.ofNullable(name).orElse(player)).open();
-            });
+            Scheduler.get().runAt(sender.getLocation(), task ->
+                new MainGui(uuid, sender, Optional.ofNullable(name).orElse(player)).open());
         }, Priority.HIGH);
     }
 

src/main/java/com/artillexstudios/axinventoryrestore/guis/CategoryGui.java

@@ -1,5 +1,6 @@
 package com.artillexstudios.axinventoryrestore.guis;
 
+import com.artillexstudios.axapi.scheduler.Scheduler;
 import com.artillexstudios.axapi.utils.ItemBuilder;
 import com.artillexstudios.axapi.utils.StringUtils;
 import com.artillexstudios.axinventoryrestore.backups.BackupData;
@@ -61,9 +62,9 @@ public void open() {
             final ItemStack it = ItemBuilder.create(MESSAGES.getSection("guis.categorygui.item"), replacements).get();
             it.setAmount(n);
 
-            categoryGui.addItem(new GuiItem(it, event -> {
-                new PreviewGui(cGui, backupData, categoryGui, categoryGui.getCurrentPageNum()).open();
-            }));
+            categoryGui.addItem(new GuiItem(it, event ->
+                Scheduler.get().runAt(viewer.getLocation(), task ->
+                    new PreviewGui(cGui, backupData, categoryGui, categoryGui.getCurrentPageNum()).open())));
 
             n++;
             if (n > 64) {
@@ -80,11 +81,10 @@ public void open() {
 
         categoryGui.setDefaultClickAction(event -> event.setCancelled(true));
 
-        categoryGui.setItem(rows, 5, new GuiItem(ItemBuilder.create(MESSAGES.getSection("gui-items.back")).get(), event2 -> {
-            lastGui.open(viewer, pageNum);
-        }));
+        categoryGui.setItem(rows, 5, new GuiItem(ItemBuilder.create(MESSAGES.getSection("gui-items.back")).get(), event2 ->
+            Scheduler.get().runAt(viewer.getLocation(), task -> lastGui.open(viewer, pageNum))));
 
-        categoryGui.open(viewer);
+        Scheduler.get().runAt(viewer.getLocation(), task -> categoryGui.open(viewer));
     }
 
     public Player getViewer() {

src/main/java/com/artillexstudios/axinventoryrestore/guis/MainGui.java

@@ -72,11 +72,9 @@ public void open() {
                     item = ItemBuilder.create(MESSAGES.getSection("categories." + saveReason), Map.of("%amount%", "" + backupDataList.size())).get();
                 }
 
-                mainGui.addItem(new GuiItem(item, event -> {
-                    Scheduler.get().run(task -> {
-                        new CategoryGui(this, backupDataList, mainGui, mainGui.getCurrentPageNum()).open();
-                    });
-                }));
+                mainGui.addItem(new GuiItem(item, event ->
+                    Scheduler.get().runAt(viewer.getLocation(), task ->
+                        new CategoryGui(this, backupDataList, mainGui, mainGui.getCurrentPageNum()).open())));
             }
             mainGui.update();
             if (AxInventoryRestore.isDebugMode()) LogUtils.debug("Opened gui for {} in {}ms", viewer.getName(), System.currentTimeMillis() - time);
@@ -89,11 +87,10 @@ public void open() {
 
         mainGui.setDefaultClickAction(event -> event.setCancelled(true));
 
-        mainGui.setItem(rows, 5, new GuiItem(ItemBuilder.create(MESSAGES.getSection("gui-items.close")).get(), event2 -> {
-            mainGui.close(viewer);
-        }));
+        mainGui.setItem(rows, 5, new GuiItem(ItemBuilder.create(MESSAGES.getSection("gui-items.close")).get(), event2 ->
+            Scheduler.get().runAt(viewer.getLocation(), task -> mainGui.close(viewer))));
 
-        mainGui.open(viewer);
+        Scheduler.get().runAt(viewer.getLocation(), task -> mainGui.open(viewer));
     }
 
     public PaginatedGui getMainGui() {

src/main/java/com/artillexstudios/axinventoryrestore/guis/PreviewGui.java

@@ -1,5 +1,6 @@
 package com.artillexstudios.axinventoryrestore.guis;
 
+import com.artillexstudios.axapi.scheduler.Scheduler;
 import com.artillexstudios.axapi.utils.ItemBuilder;
 import com.artillexstudios.axapi.utils.PaperUtils;
 import com.artillexstudios.axapi.utils.StringUtils;
@@ -75,7 +76,7 @@ public void open() {
             if (discordAddon != null) starter = 45;
 
             previewGui.setItem(starter, new GuiItem(ItemBuilder.create(MESSAGES.getSection("gui-items.back")).get(), event -> {
-                lastGui.open(viewer, pageNum);
+                Scheduler.get().runAt(viewer.getLocation(), task -> lastGui.open(viewer, pageNum));
                 event.setCancelled(true);
             }));
 
@@ -87,8 +88,9 @@ public void open() {
                     return;
                 }
 
-                PaperUtils.teleportAsync(viewer, backupData.getLocation());
-                viewer.closeInventory();
+                Scheduler.get().runAt(viewer.getLocation(), () ->
+                        PaperUtils.teleportAsync(viewer, backupData.getLocation().clone())
+                                .thenRun(() -> Scheduler.get().runAt(viewer.getLocation(), viewer::closeInventory)));
             }));
 
             boolean isEnder = backupData.getReason().equals("ENDER_CHEST");
@@ -155,7 +157,7 @@ public void open() {
             previewGui.update();
         });
 
-        previewGui.open(viewer);
+        Scheduler.get().runAt(viewer.getLocation(), () -> previewGui.open(viewer));
         if (AxInventoryRestore.isDebugMode()) LogUtils.debug("Preview gui opened for {} in {}ms", viewer.getName(), System.currentTimeMillis() - time);
     }
 }