diff --git a/src/main/java/me/despical/kotl/handlers/language/LanguageManager.java b/src/main/java/me/despical/kotl/handlers/language/LanguageManager.java
index 76842a0..26065a7 100644
--- a/src/main/java/me/despical/kotl/handlers/language/LanguageManager.java
+++ b/src/main/java/me/despical/kotl/handlers/language/LanguageManager.java
@@ -49,7 +49,7 @@ private void init() {
 		if (Collections.contains(plugin.getChatManager().message("language"), pluginLocale.aliases)) return;
 
 		try {
-			FileUtils.copyURLToFile(new URL("https://raw.githubusercontent.com/Despical/LocaleStorage/main/Minecraft/KOTL/" + pluginLocale.prefix + ".yml"), new File(plugin.getDataFolder(), "messages.yml"));
+			FileUtils.copyURLToFile(new URL("https://raw.githubusercontent.com/Despical/LocaleStorage/main/Minecraft/KOTL/%s.yml".formatted(pluginLocale.prefix)), new File(plugin.getDataFolder(), "messages.yml"));
 		} catch (IOException e) {
 			plugin.getLogger().warning("Error while connecting to internet!");
 		}
@@ -86,7 +86,7 @@ private void setupLocale() {
 			return;
 		}
 
-		plugin.getLogger().info("Loaded locale " + pluginLocale.name + " (ID: " + pluginLocale.prefix + ")");
+		plugin.getLogger().info("Loaded locale %s (ID: %s)".formatted(pluginLocale.name, pluginLocale.prefix));
 	}
 
 	public Locale getPluginLocale() {
diff --git a/src/main/java/me/despical/kotl/handlers/language/LocaleRegistry.java b/src/main/java/me/despical/kotl/handlers/language/LocaleRegistry.java
index 72f3f6a..50c5325 100644
--- a/src/main/java/me/despical/kotl/handlers/language/LocaleRegistry.java
+++ b/src/main/java/me/despical/kotl/handlers/language/LocaleRegistry.java
@@ -34,12 +34,11 @@ public class LocaleRegistry {
 
 	public static void registerLocale(Locale locale) {
 		registeredLocales.removeIf(l -> l.prefix().equals(locale.prefix()));
-
 		registeredLocales.add(locale);
 	}
 
 	public static Set<Locale> getRegisteredLocales() {
-		return new HashSet<>(registeredLocales);
+		return Set.copyOf(registeredLocales);
 	}
 
 	public static Locale getByName(String name) {
diff --git a/src/main/java/me/despical/kotl/handlers/rewards/Reward.java b/src/main/java/me/despical/kotl/handlers/rewards/Reward.java
index 9875638..ee3cf57 100644
--- a/src/main/java/me/despical/kotl/handlers/rewards/Reward.java
+++ b/src/main/java/me/despical/kotl/handlers/rewards/Reward.java
@@ -50,7 +50,7 @@ public RewardType getType() {
 		return type;
 	}
 
-	final static class SubReward {
+	public static final class SubReward {
 
 		private String executableCode;
 		private final int chance, executor;
diff --git a/src/main/java/me/despical/kotl/kits/KitManager.java b/src/main/java/me/despical/kotl/kits/KitManager.java
index 18b5897..864fa05 100644
--- a/src/main/java/me/despical/kotl/kits/KitManager.java
+++ b/src/main/java/me/despical/kotl/kits/KitManager.java
@@ -46,7 +46,14 @@ public void loadKits() {
 
 		this.isEnabled = config.getBoolean("kits-enabled");
 
-		for (final var path : config.getConfigurationSection("kits").getKeys(false)) {
+		final var section = config.getConfigurationSection("kits");
+
+		if (section == null) {
+			plugin.getLogger().warning("Section ''kits'' not found in kits.yml!");
+			return;
+		}
+
+		for (final var path : section.getKeys(false)) {
 			this.kits.add(new Kit(plugin, "kits." + path + "."));
 		}
 	}
diff --git a/src/main/java/me/despical/kotl/user/data/MysqlManager.java b/src/main/java/me/despical/kotl/user/data/MysqlManager.java
index d4dd066..a483239 100644
--- a/src/main/java/me/despical/kotl/user/data/MysqlManager.java
+++ b/src/main/java/me/despical/kotl/user/data/MysqlManager.java
@@ -125,6 +125,7 @@ public MysqlDatabase getDatabase() {
 		return database;
 	}
 
+	@NotNull
 	public String getTable() {
 		return table;
 	}
diff --git a/src/main/java/me/despical/kotl/util/CuboidSelector.java b/src/main/java/me/despical/kotl/util/CuboidSelector.java
index b8c03ae..ffb28db 100644
--- a/src/main/java/me/despical/kotl/util/CuboidSelector.java
+++ b/src/main/java/me/despical/kotl/util/CuboidSelector.java
@@ -99,13 +99,9 @@ public void onWandUse(PlayerInteractEvent event) {
 
 			case LEFT_CLICK_AIR, RIGHT_CLICK_AIR ->
 				player.sendMessage(chatManager.coloredRawMessage("&c&l✖ &cWarning | Please select solid block, not air!"));
-
-			default -> {
-			}
 		}
 	}
 
 	public record Selection(Location firstPos, Location secondPos) {
-
 	}
 }
\ No newline at end of file