From 9a23234631facb506fa107a3dbfc75502f1b6f40 Mon Sep 17 00:00:00 2001
From: Matt <m.moninger.h@gmail.com>
Date: Tue, 11 Jun 2019 05:23:18 +0200
Subject: [PATCH] Fix #9388: Crash using set grass length cheat

---
 src/openrct2/actions/SetCheatAction.hpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/openrct2/actions/SetCheatAction.hpp b/src/openrct2/actions/SetCheatAction.hpp
index 06ed56b4f3..9835ec4946 100644
--- a/src/openrct2/actions/SetCheatAction.hpp
+++ b/src/openrct2/actions/SetCheatAction.hpp
@@ -356,7 +356,11 @@ private:
         {
             for (x = 0; x < MAXIMUM_MAP_SIZE_TECHNICAL; x++)
             {
-                auto surfaceElement = map_get_surface_element_at(x, y)->AsSurface();
+                auto tileElement = map_get_surface_element_at(x, y);
+                if (tileElement == nullptr)
+                    continue;
+
+                auto surfaceElement = tileElement->AsSurface();
                 if (surfaceElement != nullptr && (surfaceElement->GetOwnership() & OWNERSHIP_OWNED)
                     && surfaceElement->GetWaterHeight() == 0 && surfaceElement->CanGrassGrow())
                 {