core/modules/user/user.module |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/modules/user/user.module b/core/modules/user/user.module
index 739e0e6..ad8eac4 100644
--- a/core/modules/user/user.module
+++ b/core/modules/user/user.module
@@ -154,7 +154,7 @@ function user_page_build(&$page) {
  */
 function user_get_permissions_hash(AccountInterface $account) {
   // Early-return if cached in session.
-  if (drupal_session_started() && isset($_SESSION['user_permissions_hash'])) {
+  if (function_exists('drupal_session_started') && drupal_session_started() && isset($_SESSION['user_permissions_hash'])) {
     return $_SESSION['user_permissions_hash'];
   }
 
@@ -170,7 +170,7 @@ function user_get_permissions_hash(AccountInterface $account) {
   }
 
   // Cache in session, if there is a session.
-  if (drupal_session_started()) {
+  if (function_exists('drupal_session_started') && drupal_session_started()) {
     $_SESSION['user_permissions_hash'] = $permissions_hash;
   }