From 69cb1d6966c347b9e45e013845d893382ce81fdf Mon Sep 17 00:00:00 2001
From: Martin Fenner <martin.fenner@datacite.org>
Date: Sun, 10 Mar 2019 20:16:05 +0100
Subject: [PATCH] fix delegation error. #213. Fixes LUPO-6.

---
 app/models/activity.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/models/activity.rb b/app/models/activity.rb
index 632db7da4..58d7004a1 100644
--- a/app/models/activity.rb
+++ b/app/models/activity.rb
@@ -168,7 +168,7 @@ def as_indexed_json(options={})
       "request_uuid" => request_uuid,
       "changes" => changes,
       "created" => created,
-      "doi" => doi.as_indexed_json
+      "doi" => doi.present? ? doi.as_indexed_json : nil
     }
   end