Fix RemoveDockingTile when adjacent to industry without neutral station

src/station_cmd.cpp

@@ -2811,10 +2811,13 @@ void RemoveDockingTile(TileIndex t)
 		if (IsTileType(tile, MP_STATION)) {
 			UpdateStationDockingTiles(Station::GetByTile(tile));
 		} else if (IsTileType(tile, MP_INDUSTRY)) {
+			Station *st = Industry::GetByTile(tile)->neutral_station;
+			if (st != nullptr) {
 				UpdateStationDockingTiles(Industry::GetByTile(tile)->neutral_station);
 			}
 		}
 	}
+}
 
 /**
  * Clear docking tile status from tiles around a removed dock, if the tile has