From ad9c85ad3c4a5d3c0b7b36041a40d43678bb9d40 Mon Sep 17 00:00:00 2001
From: Jonathan G Rennison <j.g.rennison@gmail.com>
Date: Sat, 29 Jan 2022 12:33:49 +0000
Subject: [PATCH] Fix crash when changing one-way state of road waypoints

---
 src/road_cmd.cpp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/road_cmd.cpp b/src/road_cmd.cpp
index d767717b64..fce06f423e 100644
--- a/src/road_cmd.cpp
+++ b/src/road_cmd.cpp
@@ -1149,9 +1149,13 @@ CommandCost CmdBuildRoad(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32
 					}
 
 					if (flags & DC_EXEC) {
-						RoadStop *rs = RoadStop::GetByTile(tile, GetRoadStopType(tile));
-						rs->ChangeDriveThroughDisallowedRoadDirections(dis_new);
-						MarkTileDirtyByTile(tile);
+						if (IsRoadWaypoint(tile)) {
+							SetDriveThroughStopDisallowedRoadDirections(tile, dis_new);
+						} else {
+							RoadStop *rs = RoadStop::GetByTile(tile, GetRoadStopType(tile));
+							rs->ChangeDriveThroughDisallowedRoadDirections(dis_new);
+						}
+						MarkTileDirtyByTile(tile, VMDF_NOT_MAP_MODE);
 						NotifyRoadLayoutChanged(CountBits(dis_existing) > CountBits(dis_new));
 						UpdateRoadCachedOneWayStatesAroundTile(tile);
 					}