From 76135e757f96ad640e3c44b4d46f73e512fbfc50 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 8 Feb 2017 19:01:09 +0900
Subject: Check if m->env is NULL before dereferencing it; fix #3436

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

diff --git a/src/vm.c b/src/vm.c
index c174c0b43..287b18518 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1309,7 +1309,9 @@ RETRY_TRY_BLOCK:
         else {
           stack_extend(mrb, irep->nregs, ci->argc+2);
         }
-        regs[0] = m->env->stack[0];
+        if(m->env) {
+          regs[0] = m->env->stack[0];
+        }
         pc = irep->iseq;
         JUMP;
       }
-- 
cgit v1.2.3