diff --git a/.gitignore b/.gitignore
index bba7b53..8dbe9f9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /target/
 /.idea/
+/CoinsEngine.iml
diff --git a/src/main/java/su/nightexpress/coinsengine/tops/TopManager.java b/src/main/java/su/nightexpress/coinsengine/tops/TopManager.java
index 9f03721..6f17900 100644
--- a/src/main/java/su/nightexpress/coinsengine/tops/TopManager.java
+++ b/src/main/java/su/nightexpress/coinsengine/tops/TopManager.java
@@ -15,6 +15,7 @@
 import su.nightexpress.nightcore.manager.AbstractManager;
 import su.nightexpress.nightcore.util.Lists;
 import su.nightexpress.nightcore.util.NumberUtil;
+import su.nightexpress.nightcore.util.Version;
 
 import java.util.*;
 import java.util.concurrent.ConcurrentHashMap;
@@ -34,7 +35,11 @@ public TopManager(@NotNull CoinsEnginePlugin plugin) {
     @Override
     protected void onLoad() {
         if (Config.TOPS_USE_GUI.get()) {
-            this.topMenu = this.addMenu(new TopMenu(this.plugin, this), Config.DIR_MENU, "leaderboard.yml");
+            if (Version.isAtLeast(Version.MC_1_21_4)) {
+                this.topMenu = this.addMenu(new TopMenu(this.plugin, this), Config.DIR_MENU, "leaderboard.yml");
+            } else {
+                this.plugin.error("Couldn't enabling top menu because your server's Minecraft version is not supported.");
+            }
         }
 
         this.addListener(new TopsListener(this.plugin, this));
diff --git a/src/main/java/su/nightexpress/coinsengine/user/UserBalance.java b/src/main/java/su/nightexpress/coinsengine/user/UserBalance.java
index dbb09ed..db9e750 100644
--- a/src/main/java/su/nightexpress/coinsengine/user/UserBalance.java
+++ b/src/main/java/su/nightexpress/coinsengine/user/UserBalance.java
@@ -4,8 +4,8 @@
 import su.nightexpress.coinsengine.api.CoinsEngineAPI;
 import su.nightexpress.coinsengine.api.currency.Currency;
 
-import java.util.HashMap;
 import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.function.Consumer;
 
 public class UserBalance {
@@ -13,7 +13,7 @@ public class UserBalance {
     private final Map<String, Double> balanceMap;
 
     public UserBalance() {
-        this(new HashMap<>());
+        this(new ConcurrentHashMap<>());
     }
 
     public UserBalance(@NotNull Map<String, Double> balanceMap) {