From 5d04e3316bc96c0df6084c0bf6020e3038837ad3 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sat, 2 Dec 2017 01:08:48 +0900
Subject: Check if `ci->proc` is not `NULL` and `MRB_PROC_CFUNC_P()`; fix #3867

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

(limited to 'src')

diff --git a/src/vm.c b/src/vm.c
index 15b25ecb0..5793e2f74 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -327,7 +327,8 @@ ecall(mrb_state *mrb)
   mrb_assert(!MRB_PROC_CFUNC_P(p));
   c->ensure[i] = NULL;
   nregs = p->upper->body.irep->nregs;
-  if (ci->proc->body.irep->nregs > nregs) {
+  if (ci->proc && !MRB_PROC_CFUNC_P(ci->proc) &&
+      ci->proc->body.irep->nregs > nregs) {
     nregs = ci->proc->body.irep->nregs;
   }
   cioff = ci - c->cibase;
-- 
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