From 1b9c4855a3178238ab1c71addbfa364468abb1fe Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Sat, 5 Aug 2017 01:28:11 +0900
Subject: `proc->body.irep` may be NULL; fix #3761

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

diff --git a/src/gc.c b/src/gc.c
index cd885f7e8..56d316b0d 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -647,7 +647,7 @@ gc_mark_children(mrb_state *mrb, mrb_gc *gc, struct RBasic *obj)
 
       mrb_gc_mark(mrb, (struct RBasic*)p->env);
       mrb_gc_mark(mrb, (struct RBasic*)p->target_class);
-      if (!MRB_PROC_CFUNC_P(p)) {
+      if (!MRB_PROC_CFUNC_P(p) && p->body.irep) {
         mrb_gc_mark(mrb, (struct RBasic*)p->body.irep->outer);
       }
     }
-- 
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