diff --git a/Classes/ConfigurationObjectMapper.php b/Classes/ConfigurationObjectMapper.php
index 3547e72..4929fc5 100644
--- a/Classes/ConfigurationObjectMapper.php
+++ b/Classes/ConfigurationObjectMapper.php
@@ -136,7 +136,9 @@ protected function doMapping($source, $targetType, PropertyMappingConfigurationI
 
         if (null === $this->configurationObjectConversionDTO->getResult()) {
             $result = $typeConverter->convertFrom($source, $targetType, $convertedChildProperties);
-            $this->configurationObjectConversionDTO->setResult($result);
+            if (null !== $this->configurationObjectConversionDTO) {
+                $this->configurationObjectConversionDTO->setResult($result);
+            }
         }
 
         $this->serviceFactory->runServicesFromEvent(ObjectConversionAfterServiceEventInterface::class, 'objectConversionAfter', $this->configurationObjectConversionDTO);