From 23783a44300a39efbbc312a6ca22fe61d94db857 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Thu, 27 Jun 2019 09:34:40 +0900
Subject: Skip copying delete keys in a hash; fix #4534

---
 src/hash.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/hash.c b/src/hash.c
index b4d96251c..ac6a7cd56 100644
--- a/src/hash.c
+++ b/src/hash.c
@@ -240,7 +240,7 @@ ht_compact(mrb_state *mrb, htable *t)
       if (!seg->next && i >= t->last_len) {
         goto exit;
       }
-      if (mrb_undef_p(k)) {     /* found delete key */
+      if (mrb_undef_p(k)) {     /* found deleted key */
         if (seg2 == NULL) {
           seg2 = seg;
           i2 = i;
@@ -543,6 +543,7 @@ ht_copy(mrb_state *mrb, htable *t)
       mrb_value key = seg->e[i].key;
       mrb_value val = seg->e[i].val;
 
+      if (mrb_undef_p(key)) continue; /* skip deleted key */
       if ((seg->next == NULL) && (i >= t->last_len)) {
         return t2;
       }
-- 
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