From 1c140a5b0e934097afb38809d4db45ac6a241d9d Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Sun, 21 Mar 2021 13:44:30 +0100
Subject: [PATCH] Fix crash in navmesh builder when scene gets unloaded after
 navmesh tile gets dirty

---
 Source/Engine/Navigation/NavMeshBuilder.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Source/Engine/Navigation/NavMeshBuilder.cpp b/Source/Engine/Navigation/NavMeshBuilder.cpp
index 55319bb9e..755f4179b 100644
--- a/Source/Engine/Navigation/NavMeshBuilder.cpp
+++ b/Source/Engine/Navigation/NavMeshBuilder.cpp
@@ -1016,6 +1016,8 @@ void NavMeshBuilder::Update()
         {
             NavBuildQueue.RemoveAt(i--);
             const auto scene = req.Scene.Get();
+            if (!scene)
+                continue;
 
             // Early out if scene has no bounds volumes to define nav mesh area
             if (scene->NavigationVolumes.IsEmpty())