From 861fd82926e12dc83f5a6ed0a3e1831699d60226 Mon Sep 17 00:00:00 2001
From: Pasi Kallinen <paxed@alt.org>
Date: Thu, 9 Feb 2023 08:33:32 +0200
Subject: [PATCH] Fix the part I forgot

---
 src/mon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mon.c b/src/mon.c
index fa6d3581a..5375769f3 100644
--- a/src/mon.c
+++ b/src/mon.c
@@ -4133,7 +4133,7 @@ maybe_unhide_at(coordxy x, coordxy y)
     if ((mtmp = m_at(x, y)) == 0 && u_at(x, y)) {
         mtmp = &gy.youmonst;
         undetected = u.uundetected;
-    } else {
+    } else if (mtmp) {
         undetected = mtmp->mundetected;
     }
     if (mtmp && undetected