diff --git a/typo3/sysext/form/Classes/Domain/Configuration/FormDefinition/Converters/FinisherOptionsFlexFormOverridesConverter.php b/typo3/sysext/form/Classes/Domain/Configuration/FormDefinition/Converters/FinisherOptionsFlexFormOverridesConverter.php
index 6f8cb38863b22e537d669697eca230694aab6c0f..3763bd52751e25e9720e939ed8e6de53c9b4ccd0 100644
--- a/typo3/sysext/form/Classes/Domain/Configuration/FormDefinition/Converters/FinisherOptionsFlexFormOverridesConverter.php
+++ b/typo3/sysext/form/Classes/Domain/Configuration/FormDefinition/Converters/FinisherOptionsFlexFormOverridesConverter.php
@@ -70,7 +70,7 @@ class FinisherOptionsFlexFormOverridesConverter
             return;
         }
 
-        $fieldConfiguration = $prototypeFinisherDefinition['FormEngine']['elements'][$optionKey];
+        $fieldConfiguration = $prototypeFinisherDefinition['FormEngine']['elements'][$optionKey] ?? [];
 
         if ($fieldConfiguration['section'] ?? false) {
             $processedOptionValue = [];