diff --git a/src/app.rs b/src/app.rs
index 8dfa533..1ce588e 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -92,7 +92,8 @@ impl Application {
 
     fn open(&mut self, event_loop: &ActiveEventLoop, window: Box<dyn AppWindow>) {
         let viewport_id = window.viewport_id();
-        if self.viewports.contains_key(&viewport_id) {
+        if let Some(viewport) = self.viewports.get(&viewport_id) {
+            viewport.window.focus_window();
             return;
         }
         self.viewports.insert(