From 0edbe9987b1196e5a01076e5e65409487844cfb1 Mon Sep 17 00:00:00 2001
From: Angelo Qin <qzhsjz@gmail.com>
Date: Thu, 28 Oct 2021 17:24:59 +0800
Subject: [PATCH] fix DPI scaling crash.

---
 src/plugins/platforms/windows/qwindowswindow.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index 6e75b9aa1bb..0c9f0cd90f8 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -1889,6 +1889,8 @@ void QWindowsWindow::handleDpiChanged(HWND hwnd, WPARAM wParam, LPARAM lParam)
     for (QWindow *childWindow : window()->findChildren<QWindow *>()) {
         QWindowsWindow *platformChildWindow = static_cast<QWindowsWindow *>(childWindow->handle());
         QRect currentGeometry = platformChildWindow->geometry();
+        if (!platformChildWindow)
+                continue;
         QRect scaledGeometry = QRect(currentGeometry.topLeft() * scale, currentGeometry.size() * scale);
         platformChildWindow->setGeometry(scaledGeometry);
     }