reverted:
--- b/core/lib/Drupal/Core/Path/AliasStorage.php
+++ a/core/lib/Drupal/Core/Path/AliasStorage.php
@@ -82,15 +82,6 @@
    * {@inheritdoc}
    */
   public function load($conditions) {
-     if (is_numeric($conditions)) {
-       $conditions = array('pid' => $conditions);
-     }
-     elseif (is_string($conditions)) {
-       $conditions = array('source' => $conditions);
-     }
-     elseif (!is_array($conditions)) {
-     return FALSE;
-    }
     $select = $this->connection->select('url_alias');
     foreach ($conditions as $field => $value) {
       $select->condition($field, $value);
diff -u b/core/modules/path/lib/Drupal/path/Controller/PathController.php b/core/modules/path/lib/Drupal/path/Controller/PathController.php
--- b/core/modules/path/lib/Drupal/path/Controller/PathController.php
+++ b/core/modules/path/lib/Drupal/path/Controller/PathController.php
@@ -24,6 +24,15 @@
    * @todo Remove path_admin_edit().
    */
   public function adminEdit($path) {
+    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);