diff --git a/core/modules/update/lib/Drupal/update/UpdateManager.php b/core/modules/update/lib/Drupal/update/UpdateManager.php
index fda2433..6e9e9f1 100644
--- a/core/modules/update/lib/Drupal/update/UpdateManager.php
+++ b/core/modules/update/lib/Drupal/update/UpdateManager.php
@@ -166,7 +166,7 @@ public function projectStorage($key) {
       $this->keyValueStore->delete($key);
     }
     else {
-      $projects = $this->keyValueStore->get($key);
+      $projects = $this->keyValueStore->get($key, array());
     }
     return $projects;
   }