From 0e98508c33f1808d077866bf6d58d871a2781ffa Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Wed, 27 Sep 2023 23:25:43 +0900
Subject: [PATCH] string.c (mrb_string_value_cstr): RSTR_PTR(s) may be NULL;
 fix #6067

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

diff --git a/src/string.c b/src/string.c
index 0adf933c2..bd060a9e4 100644
--- a/src/string.c
+++ b/src/string.c
@@ -2436,6 +2436,7 @@ mrb_string_value_cstr(mrb_state *mrb, mrb_value *ptr)
   check_null_byte(mrb, ps);
   p = RSTR_PTR(ps);
   len = RSTR_LEN(ps);
+  if (p == NULL) return "";
   if (p[len] == '\0') {
     return p;
   }