diff --git a/backend/app/routers/sessions.py b/backend/app/routers/sessions.py
index c463916..2ae8b5a 100644
--- a/backend/app/routers/sessions.py
+++ b/backend/app/routers/sessions.py
@@ -153,6 +153,7 @@ async def timer_action(
         "session_id": session.id,
         "block_id": event.block_id,
         "current_block_id": session.current_block_id,
+        "is_active": session.is_active,
     }
     await manager.broadcast(session.child_id, ws_payload)
 
diff --git a/frontend/src/stores/schedule.js b/frontend/src/stores/schedule.js
index 0b45669..838de7b 100644
--- a/frontend/src/stores/schedule.js
+++ b/frontend/src/stores/schedule.js
@@ -31,6 +31,11 @@ export const useScheduleStore = defineStore('schedule', () => {
       applySnapshot(event)
       return
     }
+    // Session ended
+    if (event.is_active === false) {
+      session.value = null
+      return
+    }
     // Timer events update session state
     if (event.current_block_id !== undefined && session.value) {
       session.value.current_block_id = event.current_block_id