From 25c40c2f121940a01071f4b9d928b87e28b3341b Mon Sep 17 00:00:00 2001
From: Takeshi Watanabe <takechi101010@gmail.com>
Date: Mon, 23 Apr 2018 12:06:13 +0900
Subject: Fix undefined error of pointer dereference.

---
 src/backtrace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/backtrace.c b/src/backtrace.c
index 30febdc1c..57ae7fd7f 100644
--- a/src/backtrace.c
+++ b/src/backtrace.c
@@ -51,6 +51,7 @@ each_backtrace(mrb_state *mrb, ptrdiff_t ciidx, mrb_code *pc0, each_backtrace_fu
       pc = mrb->c->cibase[i].err;
     }
     else if (i+1 <= ciidx) {
+      if (!mrb->c->cibase[i + 1].pc) continue;
       pc = &mrb->c->cibase[i+1].pc[-1];
     }
     else {
-- 
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