From d298da8e72d930ed63d2d68c1c21b12d36e1348d Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Thu, 28 Sep 2023 11:37:07 +0900
Subject: [PATCH] vm.c (eval_under): check if irep is NULL; fix #6065

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

diff --git a/src/vm.c b/src/vm.c
index 47457b129..e704f9a9d 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -898,6 +898,8 @@ eval_under(mrb_state *mrb, mrb_value self, mrb_value blk, struct RClass *c)
   }
   ci->u.target_class = c;
   p = mrb_proc_ptr(blk);
+  /* just in case irep is NULL; #6065 */
+  if (p->body.irep == NULL) return mrb_nil_value();
   CI_PROC_SET(ci, p);
   ci->n = 1;
   ci->nk = 0;