diff --git a/README.md b/README.md
index 91db39f..98ad5c5 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ The contao advanced form bundle adds a new form-field (Formpage) to forms that c
 
 ---
 
-> Working with **Contao 4.9** and up to **Contao 4.12** (PHP ^7.4 and PHP 8)
+> Working with **Contao 4.9** and up to **Contao 4.13** (PHP ^7.4 and PHP 8)
 
 ---
 
diff --git a/src/Resources/contao/forms/FormPageSwitch.php b/src/Resources/contao/forms/FormPageSwitch.php
index 1d992cc..c42a6a7 100644
--- a/src/Resources/contao/forms/FormPageSwitch.php
+++ b/src/Resources/contao/forms/FormPageSwitch.php
@@ -12,7 +12,6 @@
 use Contao\FilesModel;
 use Contao\System;
 use Contao\Widget;
-use Patchwork\Utf8;
 
 /**
  * Class FormSubmit
@@ -60,10 +59,12 @@ public function validator($input)
      */
     public function parse($arrAttributes=null)
     {
-        if (TL_MODE == 'BE')
+        $request = System::getContainer()->get('request_stack')->getCurrentRequest();
+
+        if ($request && System::getContainer()->get('contao.routing.scope_matcher')->isBackendRequest($request))
         {
             $objTemplate = new BackendTemplate('be_wildcard');
-            $objTemplate->wildcard = '### ' . Utf8::strtoupper($GLOBALS['TL_LANG']['FFL']['pageSwitch'][0]) . ' :: ' . $this->label . ' ###' . ($this->addCondition ? ' (' . $this->condition . ')' : '');
+            $objTemplate->wildcard = '### ' . mb_strtoupper($GLOBALS['TL_LANG']['FFL']['pageSwitch'][0], 'UTF-8') . ' :: ' . $this->label . ' ###' . ($this->addCondition ? ' (' . $this->condition . ')' : '');
 
             return $objTemplate->parse();
         }