From 672d6924ec0ba9aed4ded61f6918b1cfeae9ed0f Mon Sep 17 00:00:00 2001
From: Sam <sam.saffron@gmail.com>
Date: Mon, 2 May 2016 12:33:56 +1000
Subject: [PATCH] FIX: malformed <details> should not break email

---
 plugins/discourse-details/plugin.rb | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/plugins/discourse-details/plugin.rb b/plugins/discourse-details/plugin.rb
index 41a1a61a713..e51011e0869 100644
--- a/plugins/discourse-details/plugin.rb
+++ b/plugins/discourse-details/plugin.rb
@@ -19,9 +19,14 @@ after_initialize do
 
     # replace all details with their summary in emails
     fragment.css("details").each do |details|
-      summary = details.css("summary")[0]
-      summary.name = "p"
-      details.replace(summary)
+      summary = details.css("summary")
+      if summary && summary[0]
+        summary = summary[0]
+        if summary && summary.respond_to?(:name)
+          summary.name = "p"
+          details.replace(summary)
+        end
+      end
     end
   end