diff --git a/user_guide_src/source/helpers/array_helper/014.php b/user_guide_src/source/helpers/array_helper/014.php
index 99089d236598..8cd64f7f84bb 100644
--- a/user_guide_src/source/helpers/array_helper/014.php
+++ b/user_guide_src/source/helpers/array_helper/014.php
@@ -1,6 +1,6 @@
 <?php
 
-$result = array_group_by($employees, ['gender', 'hr.department']);
+$result = array_group_by($employees, ['gender', 'hr.department'], true);
 
 $result = [
     '' => [