From 0afa283a20a6bbe453bc715da7bade876efe3416 Mon Sep 17 00:00:00 2001
From: Jochen Hepp <jochen.hepp@gmx.de>
Date: Thu, 19 Apr 2018 08:04:23 +0200
Subject: [PATCH] Slack::Notifier::post (slack-notifier-2.3.1) returns an array
 of UserAgent::Result (#1878)

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

diff --git a/app/models/transaction/slack.rb b/app/models/transaction/slack.rb
index ae5ec7a95..300ba2d2d 100644
--- a/app/models/transaction/slack.rb
+++ b/app/models/transaction/slack.rb
@@ -181,7 +181,7 @@ class Transaction::Slack
         result = notifier.ping result[:subject],
                                attachments: [attachment]
       end
-      if !result.success?
+      if !result.empty? && !result[0].success?
         if sent_value
           Cache.delete(cache_key)
         end