From e5f160dc7ec4f5ae596a7129f368ccc06186c3ee Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Fri, 12 Oct 2018 19:00:45 +0900
Subject: Should not compare `undef` (deleted) key in hashes; fix #4136

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

(limited to 'src/hash.c')

diff --git a/src/hash.c b/src/hash.c
index 325c7e66f..e1ceec489 100644
--- a/src/hash.c
+++ b/src/hash.c
@@ -402,7 +402,8 @@ sg_index_get(mrb_state *mrb, seglist *t, mrb_value key, mrb_value *vp)
   size_t step = 0;
 
   while (index->table[k]) {
-    if (sg_hash_equal(mrb, t, key, index->table[k]->key)) {
+    mrb_value key2 = index->table[k]->key;
+    if (!mrb_undef_p(key2) && sg_hash_equal(mrb, t, key, key2)) {
       if (vp) *vp = index->table[k]->val;
       return TRUE;
     }
-- 
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