From 9f6aae3bf267c4fb7ac2941f000393dc8341eaa8 Mon Sep 17 00:00:00 2001
From: ocornut <omarcornut@gmail.com>
Date: Thu, 29 Sep 2022 19:48:27 +0200
Subject: [PATCH] Nav: Fixed race condition pressing Esc during popup opening
 frame causing crash.

---
 imgui.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/imgui.cpp b/imgui.cpp
index 5af4b2d99..69efe64b9 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -10859,7 +10859,7 @@ static void ImGui::NavUpdateCancelRequest()
         SetNavID(child_window->ChildId, ImGuiNavLayer_Main, 0, WindowRectAbsToRel(parent_window, child_rect));
         NavRestoreHighlightAfterMove();
     }
-    else if (g.OpenPopupStack.Size > 0 && !(g.OpenPopupStack.back().Window->Flags & ImGuiWindowFlags_Modal))
+    else if (g.OpenPopupStack.Size > 0 && g.OpenPopupStack.back().Window != NULL && !(g.OpenPopupStack.back().Window->Flags & ImGuiWindowFlags_Modal))
     {
         // Close open popup/menu
         ClosePopupToLevel(g.OpenPopupStack.Size - 1, true);