diff --git a/src/Bundle/ChillAsideActivityBundle/src/Entity/AsideActivityCategory.php b/src/Bundle/ChillAsideActivityBundle/src/Entity/AsideActivityCategory.php
index 143e430f7..6c00274ad 100644
--- a/src/Bundle/ChillAsideActivityBundle/src/Entity/AsideActivityCategory.php
+++ b/src/Bundle/ChillAsideActivityBundle/src/Entity/AsideActivityCategory.php
@@ -44,7 +44,7 @@ class AsideActivityCategory
      * @ORM\ManyToOne(targetEntity=AsideActivityCategory::class, inversedBy="children")
      * @ORM\JoinColumn(nullable=true)
      */
-    private AsideActivityCategory $parent;
+    private ?AsideActivityCategory $parent = null;
 
     /**
      * @ORM\OneToMany(targetEntity=AsideActivityCategory::class, mappedBy="parent")