diff --git a/main/admin/user_list.php b/main/admin/user_list.php
index 4aed7c65aa..ccb23b72c1 100755
--- a/main/admin/user_list.php
+++ b/main/admin/user_list.php
@@ -298,7 +298,7 @@ function prepare_user_sql_query($is_count)
         $sql .= " ) ";
     }
 
-    $variables = Session::read('variables_to_show');
+    $variables = Session::read('variables_to_show', []);
 
     $extraField = new ExtraField('user');