From e969229b77b9c3b1f6ff4de7d9ce6d15586a9c15 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Thu, 25 May 2017 12:56:19 +0900
Subject: Check backtrace info may not be set (esp. NoMemError); fix #3663

---
 src/backtrace.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src/backtrace.c')

diff --git a/src/backtrace.c b/src/backtrace.c
index 5081f1809..17b4d0968 100644
--- a/src/backtrace.c
+++ b/src/backtrace.c
@@ -138,6 +138,7 @@ mrb_print_backtrace(mrb_state *mrb)
   }
 
   backtrace = mrb_obj_iv_get(mrb, mrb->exc, mrb_intern_lit(mrb, "backtrace"));
+  if (mrb_nil_p(backtrace)) return;
   if (mrb_array_p(backtrace)) {
     print_backtrace(mrb, backtrace);
   }
@@ -198,6 +199,7 @@ mrb_unpack_backtrace(mrb_state *mrb, mrb_value backtrace)
   struct backtrace_location *bt;
   mrb_int n, i;
 
+  if (mrb_nil_p(backtrace)) return mrb_ary_new_capa(mrb, 0);
   if (mrb_array_p(backtrace)) return backtrace;
   if (!mrb_string_p(backtrace)) {
   broken:
-- 
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