From c9bf4e7f4320363c8cea87a60efc31d8dfd18dd9 Mon Sep 17 00:00:00 2001
From: Eli Zaretskii <eliz@gnu.org>
Date: Tue, 11 May 2021 16:37:37 +0300
Subject: [PATCH] Fix assertions in nth_minibuffer

* src/minibuf.c (nth_minibuffer): Avoid assertion violation when
DEPTHth minibuffer doesn't exist.  (Bug#48337)
---
 src/minibuf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/minibuf.c b/src/minibuf.c
index 167aece973a..52d1275451b 100644
--- a/src/minibuf.c
+++ b/src/minibuf.c
@@ -969,6 +969,8 @@ static Lisp_Object
 nth_minibuffer (EMACS_INT depth)
 {
   Lisp_Object tail = Fnthcdr (make_fixnum (depth), Vminibuffer_list);
+  if (NILP (tail))
+    return Qnil;
   return XCAR (tail);
 }
 
-- 
2.39.2