From 531d0fb261f428accfc0659b1232d9bf3c6ca873 Mon Sep 17 00:00:00 2001
From: Martin Jorn Rogalla <martin@martinrogalla.com>
Date: Thu, 26 Feb 2015 22:12:06 +0100
Subject: [PATCH] Sort will now raise error on nil object array input.

Sort will now throw an error when a nil object array is given as input.
See issue #3491 for more information.

Signed-off-by: Martin Jorn Rogalla <martin@martinrogalla.com>
---
 lib/jekyll/filters.rb | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/jekyll/filters.rb b/lib/jekyll/filters.rb
index d9c84fe88..e71710c9d 100644
--- a/lib/jekyll/filters.rb
+++ b/lib/jekyll/filters.rb
@@ -222,6 +222,9 @@ module Jekyll
     #
     # Returns the filtered array of objects
     def sort(input, property = nil, nils = "first")
+      if input.nil?
+          raise ArgumentError.new("Invalid object array given. Object array is null.")
+      end
       if property.nil?
         input.sort
       else