diff --git a/authentik/core/api/groups.py b/authentik/core/api/groups.py
index 94d932e1f..961633037 100644
--- a/authentik/core/api/groups.py
+++ b/authentik/core/api/groups.py
@@ -49,7 +49,7 @@ class GroupSerializer(ModelSerializer):
     users_obj = ListSerializer(
         child=GroupMemberSerializer(), read_only=True, source="users", required=False
     )
-    parent_name = CharField(source="parent.name", read_only=True)
+    parent_name = CharField(source="parent.name", read_only=True, allow_null=True)
 
     num_pk = IntegerField(read_only=True)
 
diff --git a/schema.yml b/schema.yml
index bc53d9eb9..ed7f520bd 100644
--- a/schema.yml
+++ b/schema.yml
@@ -30498,6 +30498,7 @@ components:
         parent_name:
           type: string
           readOnly: true
+          nullable: true
         users:
           type: array
           items: