From c3961847cfb9b5370814bd433b0f5c42c034801f Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Tue, 18 Apr 2017 09:55:32 +0900
Subject: Hash#dup didn't check if internal khash is initialized; fix #3609

---
 src/hash.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/hash.c b/src/hash.c
index 86dfae996..83486f6a8 100644
--- a/src/hash.c
+++ b/src/hash.c
@@ -238,7 +238,7 @@ mrb_hash_dup(mrb_state *mrb, mrb_value hash)
   ret = (struct RHash*)mrb_obj_alloc(mrb, MRB_TT_HASH, mrb->hash_class);
   ret->ht = kh_init(ht, mrb);
 
-  if (kh_size(h) > 0) {
+  if (h && kh_size(h) > 0) {
     ret_h = ret->ht;
 
     for (k = kh_begin(h); k != kh_end(h); k++) {
-- 
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