diff --git a/src/Bundle/ChillDocStoreBundle/Entity/AccompanyingCourseDocument.php b/src/Bundle/ChillDocStoreBundle/Entity/AccompanyingCourseDocument.php
index aa893de2a..9da172b13 100644
--- a/src/Bundle/ChillDocStoreBundle/Entity/AccompanyingCourseDocument.php
+++ b/src/Bundle/ChillDocStoreBundle/Entity/AccompanyingCourseDocument.php
@@ -33,7 +33,7 @@ class AccompanyingCourseDocument extends Document implements HasScopesInterface,
      * @ORM\GeneratedValue
      * @ORM\Column(type="integer")
      */
-    private $id;
+    private ?int $id = null;
 
     public function getCenters(): ?iterable
     {
diff --git a/src/Bundle/ChillDocStoreBundle/Entity/PersonDocument.php b/src/Bundle/ChillDocStoreBundle/Entity/PersonDocument.php
index f57c31156..70728b971 100644
--- a/src/Bundle/ChillDocStoreBundle/Entity/PersonDocument.php
+++ b/src/Bundle/ChillDocStoreBundle/Entity/PersonDocument.php
@@ -28,7 +28,7 @@ class PersonDocument extends Document implements HasCenterInterface, HasScopeInt
      * @ORM\GeneratedValue
      * @ORM\Column(type="integer")
      */
-    private $id;
+    private ?int $id = null;
 
     /**
      * @ORM\ManyToOne(targetEntity="Chill\PersonBundle\Entity\Person")
diff --git a/src/Bundle/ChillTaskBundle/Entity/Task/SingleTaskPlaceEvent.php b/src/Bundle/ChillTaskBundle/Entity/Task/SingleTaskPlaceEvent.php
index b4784e508..7143592fc 100644
--- a/src/Bundle/ChillTaskBundle/Entity/Task/SingleTaskPlaceEvent.php
+++ b/src/Bundle/ChillTaskBundle/Entity/Task/SingleTaskPlaceEvent.php
@@ -38,7 +38,7 @@ class SingleTaskPlaceEvent extends AbstractTaskPlaceEvent
      * @ORM\Id
      * @ORM\GeneratedValue(strategy="AUTO")
      */
-    private $id;
+    private ?int $id = null;
 
     /**
      * @var SingleTask