From a54c64034ddf562bba7b0ebc30cf483ec92502d2 Mon Sep 17 00:00:00 2001
From: Jeena <spam@jeenaparadies.net>
Date: Sun, 24 Apr 2016 01:28:27 +0200
Subject: [PATCH] Don't crash if it's not possible to attach to property

Normally one can attach to properties, but if it is of a type URL then
it crashes hard. This check just drops everything which can't be
attached by `<<`.
---
 lib/microformats2/format.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/microformats2/format.rb b/lib/microformats2/format.rb
index 7d09deb..caaeca1 100644
--- a/lib/microformats2/format.rb
+++ b/lib/microformats2/format.rb
@@ -102,7 +102,7 @@ module Microformats2
         send("#{mn}=", value)
       end
       if current = send(mn.pluralize)
-        current << value
+        current << value if current.respond_to? :<<
       else
         send("#{mn.pluralize}=", [value])
       end