From 45b48305b74f5524852333636266b8e313684afe Mon Sep 17 00:00:00 2001
From: xieqiyu <xieqiyu@easycorp.ltd>
Date: Tue, 12 Apr 2022 13:28:32 +0800
Subject: [PATCH] * Fix bug#21385.

---
 module/tree/model.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/module/tree/model.php b/module/tree/model.php
index ae318d04cb..a24c60649a 100644
--- a/module/tree/model.php
+++ b/module/tree/model.php
@@ -320,7 +320,7 @@ class treeModel extends model
 
                 ksort($treeMenu);
                 $topMenu = @array_shift($treeMenu);
-                $topMenu = explode("\n", trim($topMenu));
+                $topMenu = explode("\n", trim((string)$topMenu));
                 foreach($topMenu as $menu)
                 {
                     if(!strpos($menu, '|')) continue;