diff --git a/core/modules/link/src/Plugin/migrate/process/d6/CckLink.php b/core/modules/link/src/Plugin/migrate/process/d6/CckLink.php
index d705671..aa0e71e 100644
--- a/core/modules/link/src/Plugin/migrate/process/d6/CckLink.php
+++ b/core/modules/link/src/Plugin/migrate/process/d6/CckLink.php
@@ -50,6 +50,9 @@ public function transform($value, MigrateExecutableInterface $migrate_executable
     if (!is_array($attributes)) {
       $attributes = unserialize($attributes);
     }
+    if (!$attributes) {
+      $attributes = array();
+    }
 
     // Massage the values into the correct form for the link.
     $route['uri'] = $value['url'];