diff --git a/common/Factory/Model.php b/common/Factory/Model.php
index 1cb8c66..6f43b40 100644
--- a/common/Factory/Model.php
+++ b/common/Factory/Model.php
@@ -342,7 +342,7 @@ class Model {
     return $orm->offset($this->offset);
   }
 
-  public function one($id = null): ModelInterface {
+  public function one($id = null): ?ModelInterface {
     $result = $this->build()->findOne($id);
     if (!$result) {
       return false;
@@ -350,7 +350,7 @@ class Model {
     $result->setFactory($this);
     return $result;
   }
-  public function many(): array {
+  public function many(): ?array {
     $results = $this->build()->findMany();
     if (!$results) {
       return false;
@@ -360,7 +360,7 @@ class Model {
     }
     return $results;
   }
-  public function array(): array {
+  public function array(): ?array {
     $results = $this->build()->findArray();
     if (!$results) {
       return false;