From dbbd5b89e630ed238b209d8becee6c3742c6b67f Mon Sep 17 00:00:00 2001
From: Ted John <ted@brambles.org>
Date: Fri, 4 May 2018 20:24:35 +0100
Subject: [PATCH] Fix assert in SDL2 (debug)

---
 src/openrct2-ui/UiContext.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/openrct2-ui/UiContext.cpp b/src/openrct2-ui/UiContext.cpp
index 33980bfc9a..e652f041de 100644
--- a/src/openrct2-ui/UiContext.cpp
+++ b/src/openrct2-ui/UiContext.cpp
@@ -550,8 +550,11 @@ public:
     void CloseWindow() override
     {
         drawing_engine_dispose();
-        SDL_DestroyWindow(_window);
-        _window = nullptr;
+        if (_window != nullptr)
+        {
+            SDL_DestroyWindow(_window);
+            _window = nullptr;
+        }
     }
 
     void RecreateWindow() override