From 599a2af7ebba1510270ba4835594179deadf82a1 Mon Sep 17 00:00:00 2001
From: Yoko Harada <yokolet@gmail.com>
Date: Sun, 1 Apr 2012 16:25:16 -0400
Subject: [PATCH] Fix for issue#648. Adds Nil check to
 NokogiriHelpers.rubyStringToString(IRubyObject)

---
 ext/java/nokogiri/internals/NokogiriHelpers.java | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ext/java/nokogiri/internals/NokogiriHelpers.java b/ext/java/nokogiri/internals/NokogiriHelpers.java
index a731c2a5080..d7793fe2016 100644
--- a/ext/java/nokogiri/internals/NokogiriHelpers.java
+++ b/ext/java/nokogiri/internals/NokogiriHelpers.java
@@ -255,6 +255,7 @@ private static Charset getCharsetUTF8() {
      * this for us.
      */
     public static String rubyStringToString(IRubyObject str) {
+        if (str.isNil()) return null;
         //return rubyStringToString(str.convertToString());
         return toJavaString(str.convertToString());
     }