diff --git a/src/Infrastructure/BotSharp.Abstraction/Users/Models/User.cs b/src/Infrastructure/BotSharp.Abstraction/Users/Models/User.cs
index 7699a58b..8d136dc5 100644
--- a/src/Infrastructure/BotSharp.Abstraction/Users/Models/User.cs
+++ b/src/Infrastructure/BotSharp.Abstraction/Users/Models/User.cs
@@ -23,7 +23,6 @@ public class User
     public bool Verified { get; set; }
     public string RegionCode { get; set; } = "CN";
     public string? AffiliateId { get; set; }
-    public string? ReferralCode { get; set; }
     public string? EmployeeId { get; set; }
     public bool IsDisabled { get; set; }
     public IEnumerable<string> Permissions { get; set; } = [];
diff --git a/src/Infrastructure/BotSharp.OpenAPI/Controllers/UserController.cs b/src/Infrastructure/BotSharp.OpenAPI/Controllers/UserController.cs
index c893bcab..75b33c73 100644
--- a/src/Infrastructure/BotSharp.OpenAPI/Controllers/UserController.cs
+++ b/src/Infrastructure/BotSharp.OpenAPI/Controllers/UserController.cs
@@ -243,7 +243,7 @@ public class UserController : ControllerBase
         var file = fileStorage.GetUserAvatar();
         if (string.IsNullOrEmpty(file))
         {
-            return NotFound();
+            return NoContent();
         }
         return BuildFileResult(file);
     }
diff --git a/src/Infrastructure/BotSharp.OpenAPI/ViewModels/Users/UserCreationModel.cs b/src/Infrastructure/BotSharp.OpenAPI/ViewModels/Users/UserCreationModel.cs
index b529a832..4d2594b8 100644
--- a/src/Infrastructure/BotSharp.OpenAPI/ViewModels/Users/UserCreationModel.cs
+++ b/src/Infrastructure/BotSharp.OpenAPI/ViewModels/Users/UserCreationModel.cs
@@ -13,7 +13,6 @@ public class UserCreationModel
     public string Type { get; set; } = UserType.Client;
     public string Role { get; set; } = UserRole.User;
     public string RegionCode { get; set; } = "CN";
-    public string? ReferralCode { get; set; } 
     public User ToUser()
     {
         return new User
@@ -27,7 +26,6 @@ public class UserCreationModel
             Role = Role,
             Type = Type,
             RegionCode = RegionCode,
-            ReferralCode = ReferralCode
         };
     }
 }