diff --git a/src/Controller/MapApiController.php b/src/Controller/MapApiController.php
index 8624c66..a9f5575 100644
--- a/src/Controller/MapApiController.php
+++ b/src/Controller/MapApiController.php
@@ -6,6 +6,7 @@ use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Symfony\Component\HttpKernel\Exception\UnprocessableEntityHttpException;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 use Symfony\Component\Routing\Annotation\Route;
 
 use Doctrine\Common\Collections\ArrayCollection;
@@ -157,7 +158,7 @@ class MapApiController extends AbstractController
         else{
             $names = new ArrayCollection();
             foreach($places[0]->getNames() as $plName) { $names[] = $plName->getName(); }
-            if ($names->contains($value)) { throw new ValueError('Warning: \''.$value.'\' is already a name for place '.$placeId);}
+            if ($names->contains($value)) { throw new AccessDeniedHttpException('Warning: \''.$value.'\' is already a name for place '.$placeId);}
             else {
                 $pN = new PlaceName();
                 $pN->setPlace($places[0]);
@@ -186,7 +187,7 @@ class MapApiController extends AbstractController
         else{
             $names = new ArrayCollection();
             foreach($places[0]->getRoomUsers() as $rUser) { $names[] = $rUser->getUserName(); }
-            if ($names->contains($value)) { throw new ValueError('Warning: \''.$value.'\' is already a name for place '.$placeId);}
+            if ($names->contains($value)) { throw new AccessDeniedHttpException('Warning: \''.$value.'\' is already a name for place '.$placeId);}
             else {
                 $rU = new RoomUserName();
                 $rU->setPlace($places[0]);