diff --git a/src/bin/topola-egui/top.rs b/src/bin/topola-egui/top.rs
index f6f1977..36b5324 100644
--- a/src/bin/topola-egui/top.rs
+++ b/src/bin/topola-egui/top.rs
@@ -186,7 +186,9 @@ impl Top {
                     });
 
                     ui.menu_button(tr.text("menu-place"), |ui| {
-                        place_via.toggle_widget(ctx, ui, &mut self.is_placing_via);
+                        ui.add_enabled_ui(arc_mutex_maybe_invoker.lock().unwrap().is_some(), |ui| {
+                            place_via.toggle_widget(ctx, ui, &mut self.is_placing_via);
+                        });
                     });
 
                     ui.menu_button(tr.text("menu-route"), |ui| {