From de969942338ac440294eefb2e7846a6975f4efdd Mon Sep 17 00:00:00 2001
From: Clayton Smith <clayton.smith@shopify.com>
Date: Tue, 18 Apr 2017 11:18:58 -0400
Subject: Check if sc->mt is initialized before copying it.

---
 src/kernel.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'src/kernel.c')

diff --git a/src/kernel.c b/src/kernel.c
index ef5bc0839..ce304fd99 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -241,7 +241,12 @@ copy_class(mrb_state *mrb, mrb_value dst, mrb_value src)
     c1->super = mrb_class_ptr(mrb_obj_dup(mrb, mrb_obj_value(c0)));
     c1->super->flags |= MRB_FLAG_IS_ORIGIN;
   }
-  dc->mt = kh_copy(mt, mrb, sc->mt);
+  if (sc->mt) {
+    dc->mt = kh_copy(mt, mrb, sc->mt);
+  }
+  else {
+    dc->mt = kh_init(mt, mrb);
+  }
   dc->super = sc->super;
   MRB_SET_INSTANCE_TT(dc, MRB_INSTANCE_TT(sc));
 }
-- 
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