From b2fc4064c0bfe45435dfc8a54a838d3470446c75 Mon Sep 17 00:00:00 2001
From: CharlesChen0823 <yongchen0823@gmail.com>
Date: Thu, 15 May 2025 15:50:58 +0800
Subject: [PATCH] gpui: Avoid dereferencing null pointer (#30579)

as
[comments](https://github.com/zed-industries/zed/pull/24545#issuecomment-2872833658),
I really don't known why, But IMO, add this code is not harm.

If you think this is not necessary, can close.

Release Notes:

- N/A
---
 crates/gpui/src/platform/mac/window.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/crates/gpui/src/platform/mac/window.rs b/crates/gpui/src/platform/mac/window.rs
index 26a62aeadfd0b54d417bdff13d786b5baf4e5ccb..c49219bff18dfbdf56b05a37b6cedf7d94ad88a6 100644
--- a/crates/gpui/src/platform/mac/window.rs
+++ b/crates/gpui/src/platform/mac/window.rs
@@ -844,6 +844,9 @@ impl PlatformWindow for MacWindow {
     fn display(&self) -> Option<Rc<dyn PlatformDisplay>> {
         unsafe {
             let screen = self.0.lock().native_window.screen();
+            if screen.is_null() {
+                return None;
+            }
             let device_description: id = msg_send![screen, deviceDescription];
             let screen_number: id = NSDictionary::valueForKey_(
                 device_description,
@@ -1193,6 +1196,9 @@ impl rwh::HasDisplayHandle for MacWindow {
 fn get_scale_factor(native_window: id) -> f32 {
     let factor = unsafe {
         let screen: id = msg_send![native_window, screen];
+        if screen.is_null() {
+            return 1.0;
+        }
         NSScreen::backingScaleFactor(screen) as f32
     };