diff --git a/Doctrine/Mapper/MetaInformationFactory.php b/Doctrine/Mapper/MetaInformationFactory.php
index <HASH>..<HASH> 100644
--- a/Doctrine/Mapper/MetaInformationFactory.php
+++ b/Doctrine/Mapper/MetaInformationFactory.php
@@ -55,7 +55,7 @@ class MetaInformationFactory
         }
 
         if (!$this->annotationReader->hasDocumentDeclaration($entity)) {
-            throw new \RuntimeException(sprintf('no declaration for document found in entity %s', $className));
+            return null;
         }
 
         $metaInformation = new MetaInformation();
do not throw exception if a entity has no document annotation