diff --git a/src/Bundle/ChillCalendarBundle/Entity/Calendar.php b/src/Bundle/ChillCalendarBundle/Entity/Calendar.php
index 3f36dd908..af64024a5 100644
--- a/src/Bundle/ChillCalendarBundle/Entity/Calendar.php
+++ b/src/Bundle/ChillCalendarBundle/Entity/Calendar.php
@@ -73,7 +73,7 @@ class Calendar
      * @ORM\JoinTable(name="chill_calendar.calendar_to_thirdparties")
      * @Groups({"read"})
      */
-    private ?Collection $professionals = null;
+    private Collection $professionals;
 
     /**
      *