diff --git a/core/lib/Drupal/Core/Utility/LinkGenerator.php b/core/lib/Drupal/Core/Utility/LinkGenerator.php
index cfe0d19d13..89fce73d5b 100644
--- a/core/lib/Drupal/Core/Utility/LinkGenerator.php
+++ b/core/lib/Drupal/Core/Utility/LinkGenerator.php
@@ -157,7 +157,9 @@ public function generate($text, Url $url) {
 
     // Move attributes out of options since generateFromRoute() doesn't need
     // them. Make sure the "href" comes first for testing purposes.
-    $attributes = ['href' => ''] + $variables['options']['attributes'];
+    if (is_array($variables['options']['attributes'])) {
+      $attributes = ['href' => ''] + $variables['options']['attributes'];
+    }
     unset($variables['options']['attributes']);
     $url->setOptions($variables['options']);