diff --git a/src/app_controller.py b/src/app_controller.py
index 436c225..6a9fbcf 100644
--- a/src/app_controller.py
+++ b/src/app_controller.py
@@ -2992,7 +2992,7 @@ class AppController:
     self._pending_gui_tasks.append({'action': 'refresh_from_project'})
     # 4. Initialize ConductorEngine and run loop
    engine = multi_agent_conductor.ConductorEngine(track, self.event_queue, auto_queue=not self.mma_step_mode)
-   self.engines[self.active_track.id] = engine
+   self.engines[track.id] = engine
    # Use current full markdown context for the track execution
    track_id_param = track.id
    flat = project_manager.flat_config(self.project, self.active_discussion, track_id=track_id_param)