From 57e6a783bc0eed2a11bd64c00cbbca1d11fce04a Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Tue, 29 Apr 2014 10:32:49 +0900
Subject: fiber context may be NULL

---
 src/gc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/gc.c b/src/gc.c
index 98a79ac69..e5348fb98 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -531,7 +531,7 @@ gc_mark_children(mrb_state *mrb, struct RBasic *obj)
     {
       struct mrb_context *c = ((struct RFiber*)obj)->cxt;
 
-      mark_context(mrb, c);
+      if (c) mark_context(mrb, c);
     }
     break;
 
@@ -745,6 +745,7 @@ gc_gray_mark(mrb_state *mrb, struct RBasic *obj)
       size_t i;
       mrb_callinfo *ci;
 
+      if (!c) break;
       /* mark stack */
       i = c->stack - c->stbase;
       if (c->ci) i += c->ci->nregs;
-- 
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