diff --git a/Montage.Card.API/Entities/Impls/Setting.cs b/Montage.Card.API/Entities/Impls/Setting.cs
index f774ed0..85e1c05 100644
--- a/Montage.Card.API/Entities/Impls/Setting.cs
+++ b/Montage.Card.API/Entities/Impls/Setting.cs
@@ -8,12 +8,12 @@ namespace Montage.Card.API.Entities.Impls
 {
     public class Setting
     {
-        public string Key { get; set; }
-        public string Value { get; set; }
+        public string? Key { get; set; }
+        public string? Value { get; set; }
 
-        public T GetValue<T>()
+        public T? GetValue<T>()
         {
-            return JsonSerializer.Deserialize<T>(Value);
+            return JsonSerializer.Deserialize<T>(Value ?? throw new NullReferenceException());
         }
 
         public void SetValue<T>(T value)