diff --git a/test/Duende.Bff.Tests/Endpoints/YarpRemoteEndpointTests.cs b/test/Duende.Bff.Tests/Endpoints/YarpRemoteEndpointTests.cs
index 5d8ab57d..3a2e7839 100644
--- a/test/Duende.Bff.Tests/Endpoints/YarpRemoteEndpointTests.cs
+++ b/test/Duende.Bff.Tests/Endpoints/YarpRemoteEndpointTests.cs
@@ -212,5 +212,14 @@ public async Task response_status_403_from_remote_endpoint_should_return_403_fro
         
             response.StatusCode.Should().Be(HttpStatusCode.Forbidden);
         }
+
+        [Fact]
+        public async Task invalid_configuration_of_routes_should_return_500()
+        {
+            var req = new HttpRequestMessage(HttpMethod.Get, BffHost.Url("/api_invalid/test"));
+            var response = await BffHost.BrowserClient.SendAsync(req);
+        
+            response.StatusCode.Should().Be(HttpStatusCode.InternalServerError);
+        }
     }
 }
diff --git a/test/Duende.Bff.Tests/TestHosts/YarpBffHost.cs b/test/Duende.Bff.Tests/TestHosts/YarpBffHost.cs
index e0ebfce0..77309206 100644
--- a/test/Duende.Bff.Tests/TestHosts/YarpBffHost.cs
+++ b/test/Duende.Bff.Tests/TestHosts/YarpBffHost.cs
@@ -135,7 +135,23 @@ private void ConfigureServices(IServiceCollection services)
                                 Path = "/api_user_or_client/{**catch-all}"
                             }
                         }.WithAntiforgeryCheck()
-                         .WithAccessToken(TokenType.UserOrClient)
+                         .WithAccessToken(TokenType.UserOrClient),
+                    
+                    // This route configuration is invalid. WithAccessToken says
+                    // that the access token is required, while
+                    // WithOptionalUserAccessToken says that it is optional.
+                    // Calling this endpoint results in a run time error.
+                    new RouteConfig()
+                        {
+                            RouteId = "api_invalid",
+                            ClusterId = "cluster1",
+
+                            Match = new()
+                            {
+                                Path = "/api_invalid/{**catch-all}"
+                            }
+                        }.WithOptionalUserAccessToken()
+                         .WithAccessToken(TokenType.User),
                 },
                 
                 new[]