From 1c7cb8368cb90a5e94daed132c6f49be40931c81 Mon Sep 17 00:00:00 2001
From: Yexo <yexo@openttd.org>
Date: Thu, 29 Jan 2009 16:14:46 +0000
Subject: (svn r15295) -Fix [FS#2591] (r15190): Towns tried to build roads
 outside the map.

---
 src/road.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/road.cpp b/src/road.cpp
index f72440fef..4680911c3 100644
--- a/src/road.cpp
+++ b/src/road.cpp
@@ -26,6 +26,7 @@ bool IsPossibleCrossing(const TileIndex tile, Axis ax)
 
 RoadBits CleanUpRoadBits(const TileIndex tile, RoadBits org_rb)
 {
+	if (!IsValidTile(tile)) return ROAD_NONE;
 	for (DiagDirection dir = DIAGDIR_BEGIN; dir < DIAGDIR_END; dir++) {
 		const TileIndex neighbor_tile = TileAddByDiagDir(tile, dir);
 
-- 
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