From a440a1443c0d5ca53e5d5373d638cc452982d9c4 Mon Sep 17 00:00:00 2001
From: Koichi Murase <myoga.murase@gmail.com>
Date: Fri, 30 Sep 2022 20:07:25 +0900
Subject: [PATCH 1/2] subst: properly handle null substring

---
 subst.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/subst.c b/subst.c
index 89e40688..d7136b56 100644
--- a/subst.c
+++ b/subst.c
@@ -10862,7 +10862,7 @@ expand_array_subscript (string, sindex, quoted, flags)
   exp = substring (string, si+1, ni);
   t = expand_subscript_string (exp, quoted & ~(Q_ARITH|Q_DOUBLE_QUOTES));
   free (exp);
-  exp = sh_backslash_quote (t, abstab, 0);
+  exp = sh_backslash_quote (t == NULL ? "" : t, abstab, 0);
   free (t);
 
   slen = STRLEN (exp);
-- 
2.37.2