diff --git a/better_passwords.module b/better_passwords.module
index 2612eae..8c02e29 100644
--- a/better_passwords.module
+++ b/better_passwords.module
@@ -29,11 +29,20 @@ function better_passwords_element_info_alter(array &$info) {
 function better_passwords_after_build(array $element, FormStateInterface $form_state) {
   $config = \Drupal::config('better_passwords.settings');
 
+  if (!isset($element['#description'])) {
+    $element['#description'] = '';
+  }
+  // Set extra info on password_confirm description.
+  if (!empty($element['#description'])) {
+    $element['#description'] .= '<br/>' ;
+  }
   // Set extra info on password_confirm description.
-  $element['#description'] .= '<br/>' . t(
-    'Passwords must be at least @num characters.',
-    ['@num' => $config->get('length')]
-  );
+  if (!empty($config->get('length'))) {
+    $element['#description'] .= '<br/>' . t(
+      'Passwords must be at least @num characters.',
+      ['@num' => $config->get('length')]
+    );
+  }
   if (!empty($config->get('strength'))) {
     $element['#description'] .= '<br/>' . t('Passwords will be rated for their strength.');
   }