From d487b753c3116e7a4261404b2357f337acc2d64d Mon Sep 17 00:00:00 2001
From: William Pitcock <nenolod@dereferenced.org>
Date: Tue, 19 Mar 2019 17:30:25 +0000
Subject: [PATCH] activitypub: transmogrifier: do not allow missing lists to be
 interpreted as nil

---
 lib/pleroma/web/activity_pub/transmogrifier.ex | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/lib/pleroma/web/activity_pub/transmogrifier.ex b/lib/pleroma/web/activity_pub/transmogrifier.ex
index 7f3d8fd4b..9d536f7f5 100644
--- a/lib/pleroma/web/activity_pub/transmogrifier.ex
+++ b/lib/pleroma/web/activity_pub/transmogrifier.ex
@@ -86,11 +86,15 @@ def fix_object(object) do
   end
 
   def fix_addressing_list(map, field) do
-    if is_binary(map[field]) do
-      map
-      |> Map.put(field, [map[field]])
-    else
-      map
+    cond do
+      is_binary(map[field]) ->
+        Map.put(map, field, [map[field]])
+
+      is_nil(map[field]) ->
+        Map.put(map, field, [])
+
+      true ->
+        map
     end
   end