diff --git a/components/feed_item.php b/components/feed_item.php
index d75a03d..d9ad659 100644
--- a/components/feed_item.php
+++ b/components/feed_item.php
@@ -188,6 +188,9 @@ protected function getActionData( NEWSFEED_CLASS_Action $action )
             "userIds" => $creatorIdList,
             'createTime' => $action->getCreateTime()
         );
+        
+        //init the var to avoid notice
+        if(!isset($shouldExtend)) { $shouldExtend = ''; }
  
         $shouldExtend = $this->displayType == NEWSFEED_CMP_Feed::DISPLAY_TYPE_ACTIVITY && $lastActivity !== null;
  
@@ -746,4 +749,4 @@ public function renderMarkup( $cycle = null )
         
         return $this->render();
     }
-}
\ No newline at end of file
+}