Review changes

doctrine · Aug 8, 2018 · 2c4218c · 2c4218c
1 parent a601a69
commit 2c4218c
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lib/Doctrine/ODM/MongoDB/Aggregation/Stage/GraphLookup.php b/lib/Doctrine/ODM/MongoDB/Aggregation/Stage/GraphLookup.php
@@ -298,7 +298,7 @@ private function getDocumentPersister(ClassMetadata $class): DocumentPersister
         return $this->dm->getUnitOfWork()->getDocumentPersister($class->name);
     }
 
-    private function getReferencedFieldName(string $fieldName, array $mapping): ?string
+    private function getReferencedFieldName(string $fieldName, array $mapping): string
     {
         if (! $mapping['isOwningSide']) {
             if (isset($mapping['repositoryMethod']) || ! isset($mapping['mappedBy'])) {