From 56a83026425c1fb9ef202b190c299409de03c935 Mon Sep 17 00:00:00 2001
From: tron <tron@openttd.org>
Date: Thu, 17 Feb 2005 15:53:47 +0000
Subject: [PATCH] (svn r1882) Add a basic check if a non-existent sprite gets
 accessed. Now ottd bails out with an error message instead of segfaulting.
 This is far from perfect, some checks after loading a savegame should be
 added.

---
 spritecache.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/spritecache.c b/spritecache.c
index ada918bb34..0235bf1862 100644
--- a/spritecache.c
+++ b/spritecache.c
@@ -154,6 +154,14 @@ static void ReadSprite(SpriteID id, void *buffer)
 	byte type;
 	byte* dest;
 
+	if (_sprite_file_pos[id] == 0) {
+		error(
+			"Tried to load non-existing sprite #%d.\n"
+			"Probable cause: Wrong/missing NewGRFs",
+			id
+		);
+	}
+
 	FioSeekToFile(_sprite_file_pos[id]);
 
 	type = FioReadByte();