diff --git a/lib/models/BlubberStatusgruppeThread.php b/lib/models/BlubberStatusgruppeThread.php
index cbe9aee4f2b7b1c7b53069148c0adfd1dd78f60f..57f1d29b3da7db9de6a28341646c46fe5d72d302 100644
--- a/lib/models/BlubberStatusgruppeThread.php
+++ b/lib/models/BlubberStatusgruppeThread.php
@@ -30,7 +30,7 @@ class BlubberStatusgruppeThread extends BlubberThread
                 return $thread;
             }
         }
-        return false;
+        return null;
     }
 
     public function isReadable(string $user_id = null)
diff --git a/lib/models/Statusgruppen.php b/lib/models/Statusgruppen.php
index d064259cfcd9c9e97eeaa5f8ff47327e66147e6d..873386ab1f32c7d809e662ade3d3ccde19b309d9 100644
--- a/lib/models/Statusgruppen.php
+++ b/lib/models/Statusgruppen.php
@@ -75,6 +75,7 @@ class Statusgruppen extends SimpleORMap implements PrivacyObject
         ];
         $config['has_one']['blubberthread'] = [
             'class_name' => BlubberStatusgruppeThread::class,
+            'assoc_func' => 'findByStatusgruppe_id',
             'on_store' => 'store',
             'on_delete' => 'delete'
         ];