From be89b3bf34e8ca123e662761e0ba7623cc7d8aa6 Mon Sep 17 00:00:00 2001
From: Eric Robinson <ericjrobinson@live.com>
Date: Sun, 16 Mar 2025 19:18:23 -0400
Subject: [PATCH] Fix crash related to Monster placement

---
 Source/monster.cpp | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/Source/monster.cpp b/Source/monster.cpp
index 9b665180d..ecf6bf42e 100644
--- a/Source/monster.cpp
+++ b/Source/monster.cpp
@@ -3577,15 +3577,17 @@ tl::expected<void, std::string> InitMonsters()
 				numscattypes++;
 			}
 		}
-		while (ActiveMonsterCount < totalmonsters) {
-			const size_t typeIndex = scattertypes[GenerateRnd(numscattypes)];
-			if (currlevel == 1 || FlipCoin())
-				na = 1;
-			else if (currlevel == 2 || leveltype == DTYPE_CRYPT)
-				na = GenerateRnd(2) + 2;
-			else
-				na = GenerateRnd(3) + 3;
-			PlaceGroup(typeIndex, na);
+		if (numscattypes > 0) {
+			while (ActiveMonsterCount < totalmonsters) {
+				const size_t typeIndex = scattertypes[GenerateRnd(numscattypes)];
+				if (currlevel == 1 || FlipCoin())
+					na = 1;
+				else if (currlevel == 2 || leveltype == DTYPE_CRYPT)
+					na = GenerateRnd(2) + 2;
+				else
+					na = GenerateRnd(3) + 3;
+				PlaceGroup(typeIndex, na);
+			}
 		}
 	}
 	for (int i = 0; i < nt; i++) {