diff -u b/core/lib/Drupal/Component/Utility/Random.php b/core/lib/Drupal/Component/Utility/Random.php
--- b/core/lib/Drupal/Component/Utility/Random.php
+++ b/core/lib/Drupal/Component/Utility/Random.php
@@ -53,6 +53,7 @@
    */
   public static function string($length = 8) {
     $counter = 0;
+
     do {
       if ($counter == static::MAXIMUM_TRIES) {
         throw new \RuntimeException('Unable to generate a unique random name');
@@ -64,6 +65,7 @@
       $counter++;
     } while (isset(static::$strings[$str]));
     static::$strings[$str] = TRUE;
+
     return $str;
   }
 
@@ -85,12 +87,13 @@
    * @see \Drupal\Component\Utility\Random::string()
    */
   public static function name($length = 8) {
+    $values = array_merge(range(65, 90), range(97, 122), range(48, 57));
     $counter = 0;
+
     do {
       if ($counter == static::MAXIMUM_TRIES) {
         throw new \RuntimeException('Unable to generate a unique random name');
       }
-      $values = array_merge(range(65, 90), range(97, 122), range(48, 57));
       $max = count($values) - 1;
       $str = chr(mt_rand(97, 122));
       for ($i = 1; $i < $length; $i++) {
@@ -99,6 +102,7 @@
       $counter++;
     } while (isset(static::$names[$str]));
     static::$names[$str] = TRUE;
+
     return $str;
   }