diff --git a/After/src/Api/Customers/CustomersController.cs b/After/src/Api/Customers/CustomersController.cs
index 18842ef..9b6e24b 100644
--- a/After/src/Api/Customers/CustomersController.cs
+++ b/After/src/Api/Customers/CustomersController.cs
@@ -78,12 +78,19 @@ public IActionResult Create([FromBody] CreateCustomerDto item)
             Result<CustomerName> customerNameOrError = CustomerName.Create(item.Name);
             Result<Email> emailOrError = Email.Create(item.Email);
 
-            Result result = Result.Combine(customerNameOrError, emailOrError);
-            if (result.IsFailure)
-                return Error(result.Error);
+            if (customerNameOrError.IsFailure)
+                ModelState.AddModelError(nameof(item.Name), customerNameOrError.Error);
+            if (emailOrError.IsFailure)
+                ModelState.AddModelError(nameof(item.Email), emailOrError.Error);
+
+            if (!ModelState.IsValid)
+                return Error(ModelState);
 
             if (_customerRepository.GetByEmail(emailOrError.Value) != null)
-                return Error("Email is already in use: " + item.Email);
+            {
+                ModelState.AddModelError(nameof(item.Email), "Email is already in use: " + item.Email);
+                return Error(ModelState);
+            }
 
             var customer = new Customer(customerNameOrError.Value, emailOrError.Value);
             _customerRepository.Add(customer);
diff --git a/After/src/Api/Utils/BaseController.cs b/After/src/Api/Utils/BaseController.cs
index 80f285f..4533026 100644
--- a/After/src/Api/Utils/BaseController.cs
+++ b/After/src/Api/Utils/BaseController.cs
@@ -1,5 +1,6 @@
 using Logic.Utils;
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
 
 namespace Api.Utils
 {
@@ -24,6 +25,11 @@ protected IActionResult Ok<T>(T result)
             return base.Ok(Envelope.Ok(result));
         }
 
+        protected IActionResult Error(ModelStateDictionary modelState)
+        {
+            return BadRequest(modelState);
+        }
+
         protected IActionResult Error(string errorMessage)
         {
             return BadRequest(Envelope.Error(errorMessage));