diff --git a/app/models/site.rb b/app/models/site.rb
index b8d60fbda3..e3deb30f7b 100644
--- a/app/models/site.rb
+++ b/app/models/site.rb
@@ -85,7 +85,6 @@ class Site
                 .joins("LEFT JOIN topics t on t.id = categories.topic_id")
                 .select("categories.*, t.slug topic_slug")
                 .order(:position)
-                .to_a
 
             modifiers = []
             # some plugins may need to change the categories cached on site load