From b3e46cbe002a0ab242fb4bca63e09c37a3c6fa7c Mon Sep 17 00:00:00 2001
From: Jonathan G Rennison <j.g.rennison@gmail.com>
Date: Sun, 5 Jan 2020 14:49:11 +0000
Subject: [PATCH] Fix crash when post road-works cleanup removes all road
 pieces

---
 src/road_cmd.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/road_cmd.cpp b/src/road_cmd.cpp
index 546f5e4ca4..999ce36bbc 100644
--- a/src/road_cmd.cpp
+++ b/src/road_cmd.cpp
@@ -2156,6 +2156,10 @@ static void TileLoop_Road(TileIndex tile)
 
 			if (old_rb != new_rb) {
 				RemoveRoad(tile, DC_EXEC | DC_AUTO | DC_NO_WATER, (old_rb ^ new_rb), RTT_ROAD, true);
+				if (new_rb == 0) {
+					MarkTileDirtyByTile(tile, ZOOM_LVL_DRAW_MAP);
+					return;
+				}
 			}
 		}