From 491d68bb3004eb8d7deec4a3a682b25de0d4afc2 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Mon, 10 Apr 2017 09:28:36 +0900
Subject: Skip stack marking at all if c->stack is NULL.

---
 src/gc.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src')

diff --git a/src/gc.c b/src/gc.c
index 872b9db3e..116fd0bfd 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -545,6 +545,7 @@ mark_context_stack(mrb_state *mrb, struct mrb_context *c)
   size_t i;
   size_t e;
 
+  if (c->stack == NULL) return;
   e = c->stack - c->stbase;
   if (c->ci) e += c->ci->nregs;
   if (c->stbase + e > c->stend) e = c->stend - c->stbase;
-- 
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