From 581b1830ffff6530300d2a93251ddce6223b3b5a Mon Sep 17 00:00:00 2001
From: Pasi Kallinen <paxed@alt.org>
Date: Tue, 20 Oct 2015 17:28:16 +0300
Subject: [PATCH] Fix segfault when chameleon form fails on the Rogue level

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

diff --git a/src/mon.c b/src/mon.c
index 1ed1695a3..56b1ec155 100644
--- a/src/mon.c
+++ b/src/mon.c
@@ -3084,7 +3084,7 @@ boolean msg;      /* "The oldmon turns into a newmon!" */
             /* for the first several tries we require upper-case on
                the rogue level (after that, we take whatever we get) */
             if (tryct > 15 && Is_rogue_level(&u.uz)
-                && !isupper((uchar) mdat->mlet))
+                && mdat && !isupper((uchar) mdat->mlet))
                 mdat = 0;
             if (mdat)
                 break;