diff --git a/samples/Dantooine/Dantooine.Server/Controllers/ErrorController.cs b/samples/Dantooine/Dantooine.Server/Controllers/ErrorController.cs
index 94e00f07..86e4b028 100644
--- a/samples/Dantooine/Dantooine.Server/Controllers/ErrorController.cs
+++ b/samples/Dantooine/Dantooine.Server/Controllers/ErrorController.cs
@@ -4,30 +4,28 @@
  * the license and the contributors participating to this project.
  */
 
+using Dantooine.Server.ViewModels.Shared;
 using Microsoft.AspNetCore;
 using Microsoft.AspNetCore.Mvc;
-using Dantooine.Server.ViewModels.Shared;
 
 namespace Dantooine.Server.Controllers;
 
 public class ErrorController : Controller
 {
-    [Route("error")]
-    [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+    [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true), Route("~/error")]
     public IActionResult Error()
     {
-        // If the error was not caused by an invalid
-        // OIDC request, display a generic error page.
+        // If the error originated from the OpenIddict server, render the error details.
         var response = HttpContext.GetOpenIddictServerResponse();
-        if (response == null)
+        if (response is not null)
         {
-            return View(new ErrorViewModel());
+            return View(new ErrorViewModel
+            {
+                Error = response.Error,
+                ErrorDescription = response.ErrorDescription
+            });
         }
 
-        return View(new ErrorViewModel
-        {
-            Error = response.Error,
-            ErrorDescription = response.ErrorDescription
-        });
+        return View(new ErrorViewModel());
     }
 }
diff --git a/samples/Matty/Matty.Server/Controllers/ErrorController.cs b/samples/Matty/Matty.Server/Controllers/ErrorController.cs
index 0d5bbdb1..656930a4 100644
--- a/samples/Matty/Matty.Server/Controllers/ErrorController.cs
+++ b/samples/Matty/Matty.Server/Controllers/ErrorController.cs
@@ -4,30 +4,28 @@
  * the license and the contributors participating to this project.
  */
 
+using Matty.Server.ViewModels.Shared;
 using Microsoft.AspNetCore;
 using Microsoft.AspNetCore.Mvc;
-using Matty.Server.ViewModels.Shared;
 
 namespace Matty.Server.Controllers;
 
 public class ErrorController : Controller
 {
-    [Route("error")]
-    [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+    [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true), Route("~/error")]
     public IActionResult Error()
     {
-        // If the error was not caused by an invalid
-        // OIDC request, display a generic error page.
+        // If the error originated from the OpenIddict server, render the error details.
         var response = HttpContext.GetOpenIddictServerResponse();
-        if (response == null)
+        if (response is not null)
         {
-            return View(new ErrorViewModel());
+            return View(new ErrorViewModel
+            {
+                Error = response.Error,
+                ErrorDescription = response.ErrorDescription
+            });
         }
 
-        return View(new ErrorViewModel
-        {
-            Error = response.Error,
-            ErrorDescription = response.ErrorDescription
-        });
+        return View(new ErrorViewModel());
     }
 }
diff --git a/samples/Velusia/Velusia.Client/Controllers/ErrorController.cs b/samples/Velusia/Velusia.Client/Controllers/ErrorController.cs
index 862b3d83..19491982 100644
--- a/samples/Velusia/Velusia.Client/Controllers/ErrorController.cs
+++ b/samples/Velusia/Velusia.Client/Controllers/ErrorController.cs
@@ -6,21 +6,20 @@ namespace Velusia.Client;
 
 public class ErrorController : Controller
 {
-    [HttpGet, HttpPost, Route("~/error")]
+    [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true), Route("~/error")]
     public IActionResult Error()
     {
-        // If the error was not caused by an invalid
-        // OIDC request, display a generic error page.
+        // If the error originated from the OpenIddict client, render the error details.
         var response = HttpContext.GetOpenIddictClientResponse();
-        if (response is null)
+        if (response is not null)
         {
-            return View(new ErrorViewModel());
+            return View(new ErrorViewModel
+            {
+                Error = response.Error,
+                ErrorDescription = response.ErrorDescription
+            });
         }
 
-        return View(new ErrorViewModel
-        {
-            Error = response.Error,
-            ErrorDescription = response.ErrorDescription
-        });
+        return View(new ErrorViewModel());
     }
 }
diff --git a/samples/Velusia/Velusia.Server/Controllers/ErrorController.cs b/samples/Velusia/Velusia.Server/Controllers/ErrorController.cs
index 95f4c6e9..dca855d4 100644
--- a/samples/Velusia/Velusia.Server/Controllers/ErrorController.cs
+++ b/samples/Velusia/Velusia.Server/Controllers/ErrorController.cs
@@ -12,22 +12,20 @@ namespace Velusia.Server.Controllers;
 
 public class ErrorController : Controller
 {
-    [Route("error")]
-    [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+    [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true), Route("~/error")]
     public IActionResult Error()
     {
-        // If the error was not caused by an invalid
-        // OIDC request, display a generic error page.
+        // If the error originated from the OpenIddict server, render the error details.
         var response = HttpContext.GetOpenIddictServerResponse();
-        if (response == null)
+        if (response is not null)
         {
-            return View(new ErrorViewModel());
+            return View(new ErrorViewModel
+            {
+                Error = response.Error,
+                ErrorDescription = response.ErrorDescription
+            });
         }
 
-        return View(new ErrorViewModel
-        {
-            Error = response.Error,
-            ErrorDescription = response.ErrorDescription
-        });
+        return View(new ErrorViewModel());
     }
 }