diff -u b/core/modules/path/lib/Drupal/path/Controller/PathController.php b/core/modules/path/lib/Drupal/path/Controller/PathController.php
--- b/core/modules/path/lib/Drupal/path/Controller/PathController.php
+++ b/core/modules/path/lib/Drupal/path/Controller/PathController.php
@@ -27,12 +27,6 @@
     if (is_numeric($path)) {
        $path = array('pid' => $path);
      }
-     elseif (is_string($path)) {
-       $path = array('source' => $path);
-     }
-     elseif (!is_array($path)) {
-     return FALSE;
-    }  
     $path = \Drupal::service('path.alias_storage')->load($path);
     module_load_include('admin.inc', 'path');
     return path_admin_edit($path);