From e2e4c1d942e4f0408b1b08ab0b708462cb13335e Mon Sep 17 00:00:00 2001
From: duncanspumpkin <duncans_pumpkin@hotmail.co.uk>
Date: Tue, 9 Apr 2019 18:39:33 +0100
Subject: [PATCH] Fix #9079. Null derference checked for when getting banner
 element.

Unsure how the save managed to get in this state
---
 src/openrct2/actions/BannerSetStyleAction.hpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/openrct2/actions/BannerSetStyleAction.hpp b/src/openrct2/actions/BannerSetStyleAction.hpp
index 390db7c86f..50254ab9d0 100644
--- a/src/openrct2/actions/BannerSetStyleAction.hpp
+++ b/src/openrct2/actions/BannerSetStyleAction.hpp
@@ -96,6 +96,11 @@ public:
                 }
                 break;
             case BannerSetStyleType::NoEntry:
+                if (tileElement->AsBanner() == nullptr)
+                {
+                    log_error("Tile element was not a banner.");
+                    return MakeResult(GA_ERROR::UNKNOWN, STR_NONE);
+                }
                 break;
             default:
                 log_error("Invalid type: %u", _type);
@@ -161,6 +166,12 @@ public:
             case BannerSetStyleType::NoEntry:
             {
                 BannerElement* bannerElement = tileElement->AsBanner();
+                if (bannerElement == nullptr)
+                {
+                    log_error("Tile element was not a banner.");
+                    return MakeResult(GA_ERROR::UNKNOWN, STR_NONE);
+                }
+
                 banner->flags &= ~BANNER_FLAG_NO_ENTRY;
                 banner->flags |= (_parameter != 0) ? BANNER_FLAG_NO_ENTRY : 0;
                 uint8_t allowedEdges = 0xF;