diff --git a/core/lib/Drupal/Core/File/FileSystem.php b/core/lib/Drupal/Core/File/FileSystem.php
index 123ba820e28..428c6cb01b1 100644
--- a/core/lib/Drupal/Core/File/FileSystem.php
+++ b/core/lib/Drupal/Core/File/FileSystem.php
@@ -258,6 +258,10 @@ public function rmdir($uri, $context = NULL) {
       return rmdir($uri, $context);
     }
     else {
+      $objects = scandir($uri);
+      if (count($objects) != 2) {
+        var_dump($objects);
+      }
       return rmdir($uri);
     }
   }