From 3307cb32f43c4c9b6bd343b2db519d571ebc2d6e Mon Sep 17 00:00:00 2001
From: rubidium <rubidium@openttd.org>
Date: Thu, 21 Jun 2007 15:13:09 +0000
Subject: (svn r10249) -Fix [FS#906]: town tried to gather information about
 the neighbourhood of a tile when it couldn't even *ever* build on that tile.

---
 src/town_cmd.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index c7cd3a662..1011af7c7 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -668,6 +668,8 @@ static bool NeighborIsRoadTile(TileIndex tile, int dir, RoadBlockTitleDistance d
 
 static bool IsRoadAllowedHere(TileIndex tile, int dir)
 {
+	if (TileX(tile) < 1 || TileY(tile) < 1 || MapMaxX() >= TileX(tile) || MapMaxY() >= TileY(tile)) return false;
+
 	Slope k;
 	Slope slope;
 
-- 
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