From 8294ce9fd458a0a1acf8fcdcb6161b4a020866ad Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Thu, 4 Jul 2019 23:11:57 +0900
Subject: It was too early to check `key` for `undef`; ref #4534

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

diff --git a/src/hash.c b/src/hash.c
index ac6a7cd56..2a0a19363 100644
--- a/src/hash.c
+++ b/src/hash.c
@@ -543,10 +543,10 @@ 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;
       }
+      if (mrb_undef_p(key)) continue; /* skip deleted key */
       ht_put(mrb, t2, key, val);
     }
     seg = seg->next;
-- 
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