diff --git a/DawnLib.Dusk/src/API/Definitions/Achievements/DuskAchievementDefinition.cs b/DawnLib.Dusk/src/API/Definitions/Achievements/DuskAchievementDefinition.cs
index 239c6ab..92c79bb 100644
--- a/DawnLib.Dusk/src/API/Definitions/Achievements/DuskAchievementDefinition.cs
+++ b/DawnLib.Dusk/src/API/Definitions/Achievements/DuskAchievementDefinition.cs
@@ -75,7 +75,7 @@ protected bool TryCompleteAchievement()
         }
 
         Completed = true;
-        DuskAchievementHandler.OnAchievementUnlocked.Invoke(this);
+        DuskAchievementHandler.OnAchievementUnlocked?.Invoke(this);
         return Completed;
     }
 
diff --git a/DawnLib.Dusk/src/API/Definitions/Achievements/DuskAchievementHandler.cs b/DawnLib.Dusk/src/API/Definitions/Achievements/DuskAchievementHandler.cs
index 50d367c..ed47813 100644
--- a/DawnLib.Dusk/src/API/Definitions/Achievements/DuskAchievementHandler.cs
+++ b/DawnLib.Dusk/src/API/Definitions/Achievements/DuskAchievementHandler.cs
@@ -8,7 +8,7 @@ namespace Dusk;
 
 static class DuskAchievementHandler
 {
-    public static Action<DuskAchievementDefinition> OnAchievementUnlocked = delegate { };
+    public static Action<DuskAchievementDefinition>? OnAchievementUnlocked;
 
     internal static void LoadAll()
     {