diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88a7e4351..4bbf3ff45 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,3 +4,9 @@ Version 1.5.1
 
 - [report activity count] fix error: do not show centers which are not selected in results.
 
+`master branch`
+==============
+
+- [report activity]: add aggregator for activity users
+- fix bug: error when extracting activities without filter / aggregators selecting persons
+
diff --git a/Export/Export/CountActivity.php b/Export/Export/CountActivity.php
index 00f741fce..3498d7a13 100644
--- a/Export/Export/CountActivity.php
+++ b/Export/Export/CountActivity.php
@@ -73,12 +73,9 @@ class CountActivity implements ExportInterface
         
         $qb->select('COUNT(activity.id) as export_count_activity')
                 ->from('ChillActivityBundle:Activity', 'activity')
+                ->join('activity.person', 'person')
                 ;
         
-        if (in_array('person', $requiredModifiers)) {
-            $qb->join('activity.person', 'person');
-        }
-        
         $qb->where($qb->expr()->in('person.center', ':centers'))
             ->setParameter('centers', $centers)
             ;