diff --git a/workflow/engine/classes/model/AddonsManager.php b/workflow/engine/classes/model/AddonsManager.php
index e55114bf5..928cc3ae4 100644
--- a/workflow/engine/classes/model/AddonsManager.php
+++ b/workflow/engine/classes/model/AddonsManager.php
@@ -320,6 +320,9 @@ class AddonsManager extends BaseAddonsManager
         }
 
         $start = microtime(true);
+        $rate = null;
+        $position = null;
+        $elapsed = null;
 
         while (!feof($handle)) {
             $this->refresh();