diff --git a/src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod.php b/src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod.php
index 499502d76..4d70cbf12 100644
--- a/src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod.php
+++ b/src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod.php
@@ -716,7 +716,7 @@ class AccompanyingPeriod implements
         ;
     }
 
-    public function getCreatedAt(): DateTimeInterface
+    public function getCreatedAt(): ?DateTimeInterface
     {
         return $this->createdAt;
     }
diff --git a/src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod/Resource.php b/src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod/Resource.php
index 48479782a..c9f1e9279 100644
--- a/src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod/Resource.php
+++ b/src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod/Resource.php
@@ -96,7 +96,7 @@ class Resource
     /**
      * @Groups({"read"})
      */
-    public function getResource(): \Chill\PersonBundle\Entity\Person|\Chill\ThirdPartyBundle\Entity\ThirdParty
+    public function getResource(): \Chill\PersonBundle\Entity\Person|\Chill\ThirdPartyBundle\Entity\ThirdParty|null
     {
         return $this->person ?? $this->thirdParty;
     }