diff --git a/tac_lite.module b/tac_lite.module
index 5ce5e1a..fe487f7 100644
--- a/tac_lite.module
+++ b/tac_lite.module
@@ -181,25 +181,29 @@ function _tac_lite_user_tids($account, $scheme) {
   // when they were created. By adding 0 to the grant id, we let the
   // user view those nodes.
   $grants = [0];
-  $data = \Drupal::service('user.data')->get('tac_lite', $account->id(), 'tac_lite_scheme_' . $scheme) ?: [];
-  if (count($data)) {
-    foreach ($data as $tids) {
-      if (count($tids)) {
-        $grants = array_merge($grants, $tids);
+  if ($account->id() != NULL) {
+    $data = \Drupal::service('user.data')->get('tac_lite', $account->id(), 'tac_lite_scheme_' . $scheme) ?: [];
+    if (count($data)) {
+      foreach ($data as $tids) {
+        if (count($tids)) {
+          $grants = array_merge($grants, $tids);
+        }
       }
     }
   }

   // Add per-role grants in addition to per-user grants.
-  $settings = \Drupal::config('tac_lite.settings');
-  $defaults = $settings->get('tac_lite_grants_scheme_' . $scheme);
-  $defaults = $defaults ? $defaults : [];
-  $roles = $account->getRoles();
-  foreach ($roles as $rid) {
-    if (isset($defaults[$rid]) && count($defaults[$rid])) {
-      foreach ($defaults[$rid] as $tids) {
-        if (count($tids)) {
-          $grants = array_merge($grants, $tids);
+  if ($account->id() != NULL) {
+    $settings = \Drupal::config('tac_lite.settings');
+    $defaults = $settings->get('tac_lite_grants_scheme_' . $scheme);
+    $defaults = $defaults ? $defaults : [];
+    $roles = $account->getRoles();
+    foreach ($roles as $rid) {
+      if (isset($defaults[$rid]) && count($defaults[$rid])) {
+        foreach ($defaults[$rid] as $tids) {
+          if (count($tids)) {
+            $grants = array_merge($grants, $tids);
+          }
         }
       }
     }