From b43c146455d16695d0b5bf70448e5470fe560639 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Fri, 9 Feb 2018 12:34:54 +0900
Subject: Check `ensure` proc is NULL before calling; fix #3943

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

(limited to 'src')

diff --git a/src/vm.c b/src/vm.c
index 1f47eb99c..330bcd024 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1351,6 +1351,7 @@ RETRY_TRY_BLOCK:
       for (n=0; n<a; n++) {
         proc = mrb->c->ensure[epos+n];
         mrb->c->ensure[epos+n] = NULL;
+        if (proc == NULL) continue;
         irep = proc->body.irep;
         ci = cipush(mrb);
         ci->mid = ci[-1].mid;
-- 
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