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-rw-r--r--src/newgrf.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 7e4ba801d..20408394e 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -5478,7 +5478,8 @@ static void RailTypeMapSpriteGroup(ByteReader *buf, uint8 idcount)
{
uint8 *railtypes = AllocaM(uint8, idcount);
for (uint i = 0; i < idcount; i++) {
- railtypes[i] = _cur.grffile->railtype_map[buf->ReadByte()];
+ uint8 id = buf->ReadByte();
+ railtypes[i] = id < RAILTYPE_END ? _cur.grffile->railtype_map[id] : INVALID_RAILTYPE;
}
uint8 cidcount = buf->ReadByte();