From 04eb577b69ee74a1c0419c3c5e15621f0ce604d8 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 5 Feb 2014 12:51:17 +0900
Subject: Fiber.new{break} caused SEGV

---
 src/vm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/vm.c b/src/vm.c
index c044d5af1..aa849bf7a 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1350,7 +1350,7 @@ mrb_context_run(mrb_state *mrb, struct RProc *proc, mrb_value self, unsigned int
           ci = mrb->c->ci;
           break;
         case OP_R_BREAK:
-          if (proc->env->cioff < 0) {
+          if (!proc->env || proc->env->cioff < 0) {
             localjump_error(mrb, LOCALJUMP_ERROR_BREAK);
             goto L_RAISE;
           }
-- 
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