diff --git a/classes/tabs.php b/classes/tabs.php
index 87f10a2..2945f95 100644
--- a/classes/tabs.php
+++ b/classes/tabs.php
@@ -127,6 +127,7 @@ public function count_tabs() {
     public function get_secondlist() : object {
 
         $tabstree = new \stdClass();
+        $tabstree->tabs = [];
 
         foreach ($this->tabslist as $tab) {
             if ($tab->selected) {