diff --git a/pom.xml b/pom.xml
index 09229c9b..730d6fc4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -83,6 +83,16 @@
             <artifactId>json-simple</artifactId>
             <version>1.1</version>
         </dependency>
+        <dependency>
+            <groupId>org.jetbrains</groupId>
+            <artifactId>annotations</artifactId>
+            <version>13.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.yaml</groupId>
+            <artifactId>snakeyaml</artifactId>
+            <version>1.25</version>
+        </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
diff --git a/src/main/java/com/songoda/core/gui/GuiUtils.java b/src/main/java/com/songoda/core/gui/GuiUtils.java
index 4baf66dd..d19027b0 100644
--- a/src/main/java/com/songoda/core/gui/GuiUtils.java
+++ b/src/main/java/com/songoda/core/gui/GuiUtils.java
@@ -172,4 +172,17 @@ public class GuiUtils {
         item.setItemMeta(meta);
         return item;
     }
+
+    public static void mirrorFill(Gui gui, int row, int col, boolean mirrorRow, boolean mirrorCol, ItemStack item) {
+        gui.setItem(row, col, item);
+        if (mirrorRow) {
+            gui.setItem(gui.rows - row - 1, col, item);
+        }
+        if (mirrorCol) {
+            gui.setItem(row, 8 - col, item);
+        }
+        if (mirrorRow && mirrorCol) {
+            gui.setItem(gui.rows - row - 1, 8 - col, item);
+        }
+    }
 }
diff --git a/src/main/java/com/songoda/core/input/ChatPrompt.java b/src/main/java/com/songoda/core/input/ChatPrompt.java
index efedc714..2b4c3170 100644
--- a/src/main/java/com/songoda/core/input/ChatPrompt.java
+++ b/src/main/java/com/songoda/core/input/ChatPrompt.java
@@ -10,6 +10,9 @@ import org.bukkit.event.player.AsyncPlayerChatEvent;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.UUID;
+import java.util.logging.Level;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.player.PlayerCommandPreprocessEvent;
 import org.bukkit.plugin.Plugin;
 
 public class ChatPrompt implements Listener {
@@ -18,6 +21,7 @@ public class ChatPrompt implements Listener {
 
     private final ChatConfirmHandler handler;
     private OnClose onClose = null;
+    private OnCancel onCancel = null;
     private Listener listener;
 
     private ChatPrompt(Player player, ChatConfirmHandler hander) {
@@ -54,9 +58,14 @@ public class ChatPrompt implements Listener {
         return this;
     }
 
+    public ChatPrompt setOnCancel(OnCancel onCancel) {
+        this.onCancel = onCancel;
+        return this;
+    }
+
     private void startListener(Plugin plugin) {
         this.listener = new Listener() {
-            @EventHandler
+            @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = false)
             public void onChat(AsyncPlayerChatEvent event) {
                 Player player = event.getPlayer();
                 if (!ChatPrompt.isRegistered(player)) return;
@@ -66,7 +75,11 @@ public class ChatPrompt implements Listener {
 
                 ChatConfirmEvent chatConfirmEvent = new ChatConfirmEvent(player, event.getMessage());
 
-                handler.onChat(chatConfirmEvent);
+                try {
+                    handler.onChat(chatConfirmEvent);
+                } catch (Throwable t) {
+                    plugin.getLogger().log(Level.SEVERE, "Failed to process chat prompt", t);
+                }
 
                 if (onClose != null) {
                     plugin.getServer().getScheduler().scheduleSyncDelayedTask(plugin, () ->
@@ -74,6 +87,25 @@ public class ChatPrompt implements Listener {
                 }
                 HandlerList.unregisterAll(listener);
             }
+            @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = false)
+            public void onCancel(PlayerCommandPreprocessEvent event) {
+                Player player = event.getPlayer();
+                if (!ChatPrompt.isRegistered(player)) return;
+
+                ChatPrompt.unregister(player);
+
+                if(event.getMessage().toLowerCase().startsWith("/cancel"))
+                    event.setCancelled(true);
+
+                if (onCancel != null) {
+                    plugin.getServer().getScheduler().scheduleSyncDelayedTask(plugin, () ->
+                            onCancel.onCancel(), 0L);
+                } else if (onClose != null) {
+                    plugin.getServer().getScheduler().scheduleSyncDelayedTask(plugin, () ->
+                            onClose.onClose(), 0L);
+                }
+                HandlerList.unregisterAll(listener);
+            }
         };
 
         Bukkit.getPluginManager().registerEvents(listener, plugin);
@@ -87,6 +119,10 @@ public class ChatPrompt implements Listener {
         void onClose();
     }
 
+    public static interface OnCancel {
+        void onCancel();
+    }
+
     public static class ChatConfirmEvent {
 
         private final Player player;
diff --git a/src/main/java/com/songoda/core/settings/Config.java b/src/main/java/com/songoda/core/settings/Config.java
index b23eb33f..4c38963d 100644
--- a/src/main/java/com/songoda/core/settings/Config.java
+++ b/src/main/java/com/songoda/core/settings/Config.java
@@ -301,6 +301,7 @@ public class Config {
             if (!plugin.getDataFolder().exists())
                 plugin.getDataFolder().mkdir();
             BufferedWriter writer = new BufferedWriter(new FileWriter(configFile));
+            
             writer.write(config.toString());
             writer.flush();
             writer.close();
diff --git a/src/main/java/com/songoda/core/settings/editor/ConfigEditorGUI.java b/src/main/java/com/songoda/core/settings/editor/ConfigEditorGUI.java
index 5cb6f44e..20be0c18 100644
--- a/src/main/java/com/songoda/core/settings/editor/ConfigEditorGUI.java
+++ b/src/main/java/com/songoda/core/settings/editor/ConfigEditorGUI.java
@@ -14,6 +14,7 @@ import org.bukkit.plugin.java.JavaPlugin;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import us.myles.viaversion.libs.bungeecordchat.api.ChatColor;
 
 public class ConfigEditorGUI extends AbstractGUI {
 
@@ -69,12 +70,16 @@ public class ConfigEditorGUI extends AbstractGUI {
                         material = LegacyMaterials.CLOCK.getMaterial();
                         registerClickable(j, ((player1, inventory1, cursor, slot, type) -> {
                             ChatPrompt prompt = ChatPrompt.showPrompt(plugin, player, "Enter your new value.", event -> {
-                                if (config.isInt(setting.getCompleteKey())) {
-                                    config.set(setting.getCompleteKey(), Integer.parseInt(event.getMessage().trim()));
-                                } else if (config.isDouble(setting.getCompleteKey())) {
-                                    config.set(setting.getCompleteKey(), Double.parseDouble(event.getMessage().trim()));
-                                } else if (config.isLong(setting.getCompleteKey())) {
-                                    config.set(setting.getCompleteKey(), Long.parseLong(event.getMessage().trim()));
+                                try {
+                                    if (config.isInt(setting.getCompleteKey())) {
+                                        config.set(setting.getCompleteKey(), Integer.parseInt(event.getMessage().trim()));
+                                    } else if (config.isDouble(setting.getCompleteKey())) {
+                                        config.set(setting.getCompleteKey(), Double.parseDouble(event.getMessage().trim()));
+                                    } else if (config.isLong(setting.getCompleteKey())) {
+                                        config.set(setting.getCompleteKey(), Long.parseLong(event.getMessage().trim()));
+                                    }
+                                } catch (NumberFormatException e) {
+                                    player1.sendMessage(ChatColor.RED + "Error: \"" + event.getMessage().trim() + "\" is not a number!");
                                 }
                             });
                             prompt.setOnClose(() -> init("Settings Editor", inventory.getSize()));
diff --git a/src/main/java/com/songoda/core/settings/editor/ConfigListEditorGUI.java b/src/main/java/com/songoda/core/settings/editor/ConfigListEditorGUI.java
index b05ebe82..2e6d01d3 100644
--- a/src/main/java/com/songoda/core/settings/editor/ConfigListEditorGUI.java
+++ b/src/main/java/com/songoda/core/settings/editor/ConfigListEditorGUI.java
@@ -4,7 +4,6 @@ import com.songoda.core.input.ChatPrompt;
 import com.songoda.core.compatibility.LegacyMaterials;
 import com.songoda.core.settings.Setting;
 import com.songoda.core.utils.gui.AbstractGUI;
-import org.bukkit.Material;
 import org.bukkit.entity.Player;
 import org.bukkit.plugin.java.JavaPlugin;
 
diff --git a/src/main/java/com/songoda/core/utils/gui/AbstractGUI.java b/src/main/java/com/songoda/core/utils/gui/AbstractGUI.java
index 85aaa762..8ced3034 100644
--- a/src/main/java/com/songoda/core/utils/gui/AbstractGUI.java
+++ b/src/main/java/com/songoda/core/utils/gui/AbstractGUI.java
@@ -20,6 +20,7 @@ import org.bukkit.plugin.java.JavaPlugin;
 
 import java.util.*;
 
+@Deprecated
 public abstract class AbstractGUI implements Listener {
 
     private static boolean listenersInitialized = false;
diff --git a/src/main/java/com/songoda/core/utils/gui/Clickable.java b/src/main/java/com/songoda/core/utils/gui/Clickable.java
index fa169be8..a640495f 100644
--- a/src/main/java/com/songoda/core/utils/gui/Clickable.java
+++ b/src/main/java/com/songoda/core/utils/gui/Clickable.java
@@ -5,6 +5,7 @@ import org.bukkit.event.inventory.ClickType;
 import org.bukkit.inventory.Inventory;
 import org.bukkit.inventory.ItemStack;
 
+@Deprecated
 public interface Clickable {
 
     void Clickable(Player player, Inventory inventory, ItemStack cursor, int slot, ClickType type);
diff --git a/src/main/java/com/songoda/core/utils/gui/OnClose.java b/src/main/java/com/songoda/core/utils/gui/OnClose.java
index 684ce9ce..c02223c7 100644
--- a/src/main/java/com/songoda/core/utils/gui/OnClose.java
+++ b/src/main/java/com/songoda/core/utils/gui/OnClose.java
@@ -3,6 +3,7 @@ package com.songoda.core.utils.gui;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.Inventory;
 
+@Deprecated
 public interface OnClose {
 
     void OnClose(Player player, Inventory inventory);
diff --git a/src/main/java/com/songoda/core/utils/gui/Range.java b/src/main/java/com/songoda/core/utils/gui/Range.java
index 22e0620a..d993c424 100644
--- a/src/main/java/com/songoda/core/utils/gui/Range.java
+++ b/src/main/java/com/songoda/core/utils/gui/Range.java
@@ -1,10 +1,10 @@
 package com.songoda.core.utils.gui;
 
-import com.songoda.core.SongodaCore;
 import com.songoda.core.compatibility.ServerVersion;
 import org.bukkit.Sound;
 import org.bukkit.event.inventory.ClickType;
 
+@Deprecated
 public class Range {
 
     private int min;