diff --git a/src/lib/Data/Mapper/ContentUpdateMapper.php b/src/lib/Data/Mapper/ContentUpdateMapper.php
index 93d226f..10f0f8f 100644
--- a/src/lib/Data/Mapper/ContentUpdateMapper.php
+++ b/src/lib/Data/Mapper/ContentUpdateMapper.php
@@ -58,6 +58,7 @@ private function configureOptions(OptionsResolver $optionsResolver)
     {
         $optionsResolver
             ->setRequired(['languageCode', 'contentType', 'currentFields'])
-            ->setAllowedTypes('contentType', ContentType::class);
+            ->setAllowedTypes('contentType', ContentType::class)
+            ->setDefault('currentFields', []);
     }
 }