fix error with doctrine:fixtures:load

src/Bundle/ChillCalendarBundle/Event/ListenToActivityCreate.php

@@ -20,6 +20,11 @@ class ListenToActivityCreate
     {
         // Get the calendarId from the request
         $request = $this->requestStack->getCurrentRequest();
+
+        if (null === $request) {
+            return;
+        }
+        
         if ($request->query->has('activityData')) {
             $activityData = $request->query->get('activityData');
             if (array_key_exists('calendarId', $activityData)) {
@@ -37,4 +42,4 @@ class ListenToActivityCreate
         $em->flush();
 
     }
-}
+}