From 3db1e7858ff6821664f94e968068c7489c3c605f Mon Sep 17 00:00:00 2001
From: cohrs <cohrs>
Date: Mon, 24 Jun 2002 05:10:44 +0000
Subject: [PATCH] fix crash when using ';' to look at I monsters Reported to
 the mailing list.  If you set your monster symbol options, and use ';' and
 select a known invisible monster by screen, a crash would occur accessing a
 null pointer.

---
 doc/fixes34.1 | 1 +
 src/pager.c   | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/doc/fixes34.1 b/doc/fixes34.1
index 076364f1c..5cba6be94 100644
--- a/doc/fixes34.1
+++ b/doc/fixes34.1
@@ -118,6 +118,7 @@ prevent "remove_object: obj not on floor" panic for iron ball placement if
 	riding while punished leads to a fall off steed when changing levels
 specifying -D (or -X) to enter explore mode while restarting from a save
 	file was lost in the restore process
+fix crash when using lookat on an known invisible monster with monster syms set
 
 
 Platform- and/or Interface-Specific Fixes
diff --git a/src/pager.c b/src/pager.c
index 010788355..d89e69086 100644
--- a/src/pager.c
+++ b/src/pager.c
@@ -531,7 +531,8 @@ do_look(quick)
 
 	/* Check for monsters */
 	for (i = 0; i < MAXMCLASSES; i++) {
-	    if (sym == (from_screen ? monsyms[i] : def_monsyms[i])) {
+	    if (sym == (from_screen ? monsyms[i] : def_monsyms[i]) &&
+		monexplain[i]) {
 		need_to_look = TRUE;
 		if (!found) {
 		    Sprintf(out_str, "%c       %s", sym, an(monexplain[i]));