Update [broken]

src/display/app.rs

@@ -32,6 +32,11 @@ impl ApplicationHandler for App {
     fn window_event(&mut self, event_loop: &ActiveEventLoop, _id: WindowId, event: WindowEvent) {
         match event {
             WindowEvent::CloseRequested => {
+                match self.render_context.as_ref() {
+                    Some(render_context) => render_context.exit(),
+                    None => log::warn!("Window closed but no render context found"),
+                };
+
                 log::debug!("The close button was pressed; stopping");
                 event_loop.exit();
             }