diff --git a/Classes/DataProcessing/FlexFormProcessor.php b/Classes/DataProcessing/FlexFormProcessor.php
index 60b72e18..1b283484 100644
--- a/Classes/DataProcessing/FlexFormProcessor.php
+++ b/Classes/DataProcessing/FlexFormProcessor.php
@@ -99,7 +99,7 @@ public function process(ContentObjectRenderer $cObj, array $contentObjectConfigu
             $fieldName = 'pi_flexform';
         }
 
-        if (!$processedData['data'][$fieldName] && !$processedData[$fieldName]) {
+        if (!isset($processedData['data'][$fieldName]) && !isset($processedData[$fieldName])) {
             return $processedData;
         }