diff --git a/Classes/Updates/SwitchableControllerActionsPluginUpdater.php b/Classes/Updates/SwitchableControllerActionsPluginUpdater.php
index 41d745b..aa5ef71 100644
--- a/Classes/Updates/SwitchableControllerActionsPluginUpdater.php
+++ b/Classes/Updates/SwitchableControllerActionsPluginUpdater.php
@@ -181,18 +181,19 @@ protected function getTargetListType(string $sourceListType, string $switchableC
 
     protected function getAllowedSettingsFromFlexForm(string $listType): array
     {
-        $flexFormFile = $GLOBALS['TCA']['tt_content']['columns']['pi_flexform']['config']['ds'][$listType . ',list'];
-        $flexFormContent = file_get_contents(GeneralUtility::getFileAbsFileName(substr(trim($flexFormFile), 5)));
-        $flexFormData = GeneralUtility::xml2array($flexFormContent);
-
-        // Iterate each sheet and extract all settings
         $settings = [];
-        foreach ($flexFormData['sheets'] as $sheet) {
-            foreach ($sheet['ROOT']['el'] as $setting => $tceForms) {
-                $settings[] = $setting;
+        $flexFormFile = $GLOBALS['TCA']['tt_content']['columns']['pi_flexform']['config']['ds'][$listType . ',list'];
+        if ($flexFormFile) {
+            $flexFormContent = file_get_contents(GeneralUtility::getFileAbsFileName(substr(trim($flexFormFile), 5)));
+            $flexFormData = GeneralUtility::xml2array($flexFormContent);
+
+            // Iterate each sheet and extract all settings
+            foreach ($flexFormData['sheets'] as $sheet) {
+                foreach ($sheet['ROOT']['el'] as $setting => $tceForms) {
+                    $settings[] = $setting;
+                }
             }
         }
-
         return $settings;
     }
 
diff --git a/README.md b/README.md
index 4679293..08895a1 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # fp_masterquiz
 
-version 4.2.1
+version 4.2.2
 
 TYPO3 extension to create a quiz, poll or test. The participant result will be saved in the DB too and can be deleted automatically via Scheduler.
 
diff --git a/ext_emconf.php b/ext_emconf.php
index 582bc3c..d4dea4a 100644
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -18,7 +18,7 @@
     'state' => 'stable',
     'createDirs' => '',
     'clearCacheOnLoad' => 0,
-    'version' => '4.2.1',
+    'version' => '4.2.2',
     'constraints' => [
         'depends' => [
             'typo3' => '12.4.0-12.4.99',