diff --git a/src/AbstractRepository.php b/src/AbstractRepository.php
index 6891174..c761279 100644
--- a/src/AbstractRepository.php
+++ b/src/AbstractRepository.php
@@ -207,7 +207,7 @@ public function getFormReference(string $field, Form $form): mixed
 			return $this->getReference($data);
 		}
 
-		return Arrays::walk($data, fn($id) => yield $id => $this->getReference($id));
+		return Arrays::walk($data ?? [], fn($id) => yield $id => $this->getReference($id));
 	}