diff --git a/core/modules/node/node.api.php b/core/modules/node/node.api.php
index fd099a95b3ba76a897f2d204e4c16986f1d5c165..8110c8309bd791a6c6a0d99e462a55eed726c776 100644
--- a/core/modules/node/node.api.php
+++ b/core/modules/node/node.api.php
@@ -83,7 +83,9 @@ function hook_node_grants(\Drupal\Core\Session\AccountInterface $account, $op) {
   if ($account->hasPermission('access private content')) {
     $grants['example'] = array(1);
   }
-  $grants['example_author'] = array($account->id());
+  if ($account->id()) {
+    $grants['example_author'] = array($account->id());
+  }
   return $grants;
 }
 
@@ -175,14 +177,16 @@ function hook_node_access_records(\Drupal\node\NodeInterface $node) {
     // means there are many groups of just 1 user.
     // Note that an author can always view his or her nodes, even if they
     // have status unpublished.
-    $grants[] = array(
-      'realm' => 'example_author',
-      'gid' => $node->getOwnerId(),
-      'grant_view' => 1,
-      'grant_update' => 1,
-      'grant_delete' => 1,
-      'langcode' => 'ca'
-    );
+    if ($node->getOwnerId()) {
+      $grants[] = array(
+        'realm' => 'example_author',
+        'gid' => $node->getOwnerId(),
+        'grant_view' => 1,
+        'grant_update' => 1,
+        'grant_delete' => 1,
+        'langcode' => 'ca'
+      );
+    }
 
     return $grants;
   }