From 70e29d4f20702ac9e858d62765a8cf1ed6c530d0 Mon Sep 17 00:00:00 2001
From: Nicholas Hastings <skamonkey@gmail.com>
Date: Thu, 21 Mar 2013 01:22:08 -0400
Subject: [PATCH] Fixed IsMapValid passing blank string to engine's IsMapValid
 which crashes some games.

---
 core/HalfLife2.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/core/HalfLife2.cpp b/core/HalfLife2.cpp
index 64aedf78..69cf7aae 100644
--- a/core/HalfLife2.cpp
+++ b/core/HalfLife2.cpp
@@ -1243,6 +1243,9 @@ static bool ResolveFuzzyMapName(const char *fuzzyName, char *outFullname, int si
 
 bool CHalfLife2::IsMapValid(const char *map)
 {
+	if (!map || !map[0])
+		return false;
+
 	bool ret = engine->IsMapValid(map);
 #if SOURCE_ENGINE >= SE_LEFT4DEAD
 	if (!ret)