diff --git a/Controller/SingleTaskController.php b/Controller/SingleTaskController.php
index 926235998..bc2254ec9 100644
--- a/Controller/SingleTaskController.php
+++ b/Controller/SingleTaskController.php
@@ -430,26 +430,27 @@ class SingleTaskController extends AbstractController
         $viewParams['center'] = null;
         $params['types'] = null;
 
+        
         // Get parameters from url
         if (!empty($request->query->get('person_id', NULL))) {
-            $personId = $request->query->getInt('person_id');
+            
+            $personId = $request->query->getInt('person_id', 0);
             $person = $personRepository->find($personId);
 
             if ($person === null) {
                  throw $this->createNotFoundException("This person ' $personId ' does not exist.");
             }
-
             $this->denyAccessUnlessGranted(PersonVoter::SEE, $person);
 
             $viewParams['person'] = $person;
             $params['person'] = $person;
-        } elseif (!empty($request->query->get('center_id', NULL))) {
+        }
+        
+        if (!empty($request->query->get('center_id', NULL))) {
             $center = $centerRepository->find($request->query->getInt('center_id'));
-            
             if ($center === null) {
                 throw $this->createNotFoundException('center not found');
             }
-            
             $params['center'] = $center;
         }
         
@@ -459,14 +460,13 @@ class SingleTaskController extends AbstractController
                 $params['types'] = $types;
             }
         }
-
+        
         if (!empty($request->query->get('user_id', null))) {
             if ($request->query->get('user_id') === '_unassigned') {
                 $params['unassigned'] = true;
             } else {
-                $userId = $request->query->getInt('user_id', 0); // sf4 check:
-                // prevent error: `Argument 2 passed to ::getInt() must be of the type int, null given`
                 
+                $userId = $request->query->getInt('user_id', 0);
                 $user = $this->getDoctrine()->getManager()
                     ->getRepository('ChillMainBundle:User')
                     ->find($userId);
@@ -482,8 +482,7 @@ class SingleTaskController extends AbstractController
 
         if (!empty($request->query->get('scope_id'))) {
 
-            $scopeId = $request->query->getInt('scope_id', 0); // sf4 check:
-            // prevent error: `Argument 2 passed to ::getInt() must be of the type int, null given`
+            $scopeId = $request->query->getInt('scope_id', 0);
             
             $scope = $this->getDoctrine()->getManager()
                 ->getRepository('ChillMainBundle:Scope')
diff --git a/Resources/views/SingleTask/index.html.twig b/Resources/views/SingleTask/index.html.twig
index 2caaeceec..da557853f 100644
--- a/Resources/views/SingleTask/index.html.twig
+++ b/Resources/views/SingleTask/index.html.twig
@@ -15,24 +15,20 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #}
 
-{% extends "@ChillPerson/layout.html.twig" %}
+{% extends layout %}
 
 {% set activeRouteKey = 'chill_task_single_task_new' %}
 
 {% block title %}{{ 'Task list'|trans }}{% endblock %}
 
 {% macro thead() %}
-
 {% endmacro %}
 
 {% macro row(task) %}
-
 {% endmacro %}
 
 
-{# filter tasks #}
-{% block filtertasks %}{#
-    sf4 check: prevent error message: `A block definition cannot be nested under non-capturing nodes.` #}
+{% block filtertasks %}
 {% if person is not null %}
     {% block personcontent %}
         {% include 'ChillTaskBundle:SingleTask:_list.html.twig' %}