diff --git a/Classes/Finishers/SaveFormDataFinisher.php b/Classes/Finishers/SaveFormDataFinisher.php
index 7a641b7..6e168d2 100644
--- a/Classes/Finishers/SaveFormDataFinisher.php
+++ b/Classes/Finishers/SaveFormDataFinisher.php
@@ -77,7 +77,7 @@ protected function saveFormData(): void
         $formData->setFormData($formFieldsData);
         $formData->setDate(new \DateTime());
         $formData->setSiteName($this->options['siteName'] ?? '');
-        $formData->setContentDimensions($this->options['contentDimensions'] ?? '');
+        $formData->setContentDimensions($this->options['contentDimensions'] ?? []);
 
         $this->formDataRepository->add($formData);
     }