diff --git a/apps/lightcraft/src/main.rs b/apps/lightcraft/src/main.rs
index a0394da9..aedbf7fb 100644
--- a/apps/lightcraft/src/main.rs
+++ b/apps/lightcraft/src/main.rs
@@ -52,8 +52,15 @@ struct App(LightcraftApp, PrefsWriter, #[cfg(target_os = "macos")] Option<native
 impl eframe::App for App {
     fn logic(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
         #[cfg(target_os = "macos")]
-        if let Some(m) = self.2.as_mut() {
-            m.update(&mut self.0, ctx);
+        if let Some(m) = self.2.as_mut()
+            && m.update(&mut self.0, ctx)
+            && lightcraft_ui_egui::panels::notices::may_close(&mut self.0)
+        {
+            // Quit from the menu bar: save exactly what closing the window saves (settings and
+            // library, after the unsaved-changes check; otherwise its prompt shows), then end the
+            // process instead of closing the viewport while AppKit is terminating (PR #444).
+            eframe::App::on_exit(self);
+            std::process::exit(0);
         }
         self.0.logic(ctx);
         self.1.tick(&mut self.0, ctx);
diff --git a/apps/lightcraft/src/native_menu.rs b/apps/lightcraft/src/native_menu.rs
index 647f7e27..256faa1f 100644
--- a/apps/lightcraft/src/native_menu.rs
+++ b/apps/lightcraft/src/native_menu.rs
@@ -355,12 +355,15 @@ impl NativeMenu {
     }
 
     /// Per frame: run chosen items, then sync labels / enabled / checked and the text-focus
-    /// accelerators with the app state.
-    pub fn update(&mut self, app: &mut LightcraftApp, ctx: &egui::Context) {
+    /// accelerators with the app state. Returns whether Quit was chosen: the caller saves
+    /// everything and exits the process itself (closing the viewport while AppKit terminates the
+    /// app can crash in winit's teardown, PR #444).
+    pub fn update(&mut self, app: &mut LightcraftApp, ctx: &egui::Context) -> bool {
         lightcraft_ui_egui::i18n::set_language(app.ui.language);
+        let mut quit = false;
         while let Ok(key) = self.rx.try_recv() {
             if key == QUIT {
-                ctx.send_viewport_cmd(egui::ViewportCommand::Close);
+                quit = true;
                 continue;
             }
             if key == "app.about" || key == SETTINGS {
@@ -375,7 +378,7 @@ impl NativeMenu {
         let bar = menu_bar(app);
         if structure_of(&bar) != self.structure {
             self.rebuild(app);
-            return;
+            return quit;
         }
         fn walk(nodes: &[MenuNode], items: &mut HashMap<String, Item>) {
             for n in nodes {
@@ -429,6 +432,7 @@ impl NativeMenu {
             }
             self.publish_shortcuts(app);
         }
+        quit
     }
 }