From 249fef7dc49ee5c22256aa7e9c36cd788e0ba323 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Fri, 12 Oct 2018 08:30:57 +0900
Subject: Add `NULL` check in `sg_compact()`; fix #4139

---
 src/hash.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/hash.c')

diff --git a/src/hash.c b/src/hash.c
index 5bccb3091..325c7e66f 100644
--- a/src/hash.c
+++ b/src/hash.c
@@ -226,12 +226,14 @@ sg_index(mrb_state *mrb, seglist *t)
 static void
 sg_compact(mrb_state *mrb, seglist *t)
 {
-  segment *seg = t->rootseg;
+  segment *seg;
   mrb_int i;
   segment *seg2 = NULL;
   mrb_int i2;
   mrb_int size = 0;
 
+  if (t == NULL) return;
+  seg = t->rootseg;
   if (t->index && (size_t)t->size == t->index->size) {
     sg_index(mrb, t);
     return;
-- 
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