diff --git a/party/rooms.py b/party/rooms.py
index eb6ac07..e2ebc94 100644
--- a/party/rooms.py
+++ b/party/rooms.py
@@ -58,6 +58,7 @@ class BaseRoom:
     Spillet (`game`) skal have deadline, hold_until, tick(), phase_key() og drain_events()."""
 
     mic_laughs = 0
+    closed = False  # lukket (fx skiftet til et andet spil): sene opgaver må ikke vække rummet igen
 
     def __init__(self, code: str, game, host_username: str):
         self.code = code
@@ -84,6 +85,8 @@ class BaseRoom:
 
     def changed(self):
         """Kald efter hver ændring: planlæg timer og send nyt snapshot til alle."""
+        if self.closed:
+            return
         self.touch()
         self._phase_key = self.game.phase_key()
         self.handle_events()
@@ -111,7 +114,7 @@ class BaseRoom:
         self.game.hold_until = hold
 
     def broadcast(self):
-        if not self._broadcast_pending:
+        if not self._broadcast_pending and not self.closed:
             self._broadcast_pending = True
             asyncio.get_running_loop().create_task(self._broadcast())
 
@@ -130,6 +133,8 @@ class BaseRoom:
         if self._timer:
             self._timer.cancel()
             self._timer = None
+        if self.closed:
+            return
         deadline = self.game.deadline
         if deadline is not None:
             when = max(deadline, self.game.hold_until or 0)
@@ -151,8 +156,10 @@ class BaseRoom:
             self._schedule_timer()
 
     def close(self):
+        self.closed = True
         if self._timer:
             self._timer.cancel()
+            self._timer = None
         for h in self._side_timers:
             h.cancel()
         if self._voice_task:
@@ -210,7 +217,7 @@ class BaseRoom:
     def say(self, text: str | None, blocking: bool = True, voice: str | None = None):
         """Læg en replik i kø. Lyden genereres med det samme, men udgives i rækkefølge.
         blocking=False: en sidebemærkning, som ikke holder skærmen tilbage (fx "det var sandheden")."""
-        if not text:
+        if not text or self.closed:
             return
         if self._voice_queue is None:
             self._voice_queue = asyncio.Queue()
diff --git a/party/tegn.py b/party/tegn.py
index 6ec4536..8c19bee 100644
--- a/party/tegn.py
+++ b/party/tegn.py
@@ -55,6 +55,8 @@ class TegnRoom(rooms.BaseRoom):
         for h in self._beat_timers:
             h.cancel()
         self._beat_timers = []
+        if self.closed:
+            return
         g = self.game
         if g.phase != "reveal":
             return
diff --git a/party/tests/test_switch.py b/party/tests/test_switch.py
index 10098c3..c14f0c7 100644
--- a/party/tests/test_switch.py
+++ b/party/tests/test_switch.py
@@ -181,3 +181,27 @@ class SwitchGameTests(TransactionTestCase):
         self.assertEqual((st["game"], st["me"]["role"], st["me"]["name"]), ("fof", "audience", "Spiller9"))
         await phone.disconnect()
         room.close()
+
+    async def test_a_closed_room_stays_asleep(self):
+        """Sene opgaver i det gamle rum (speaker, dommer, timere) må ikke vække det efter et skift midt i et spil."""
+        await asyncio.to_thread(make_bank)
+        resp = await self.async_client.post("/host/new", {"game": "fof"}, **HOST)
+        old = rooms.get_room(resp["Location"].rstrip("/").rsplit("/", 1)[-1])
+        for n in ("A", "B"):
+            old.game.join(n)
+        old.game.start(None, 0)
+        old.changed()
+        self.assertIsNotNone(old._timer)                    # kategorien har en deadline
+        create_tegn_room("agw", "http://testserver", code=old.code)
+        self.assertTrue(old.closed)
+        self.assertIsNone(old._timer)
+        await asyncio.sleep(0.01)                           # udsendelsen fra før skiftet er sendt (til ingen)
+        old.changed()                                       # som når en sen opgave er færdig
+        old._schedule_timer()
+        old.say("en sen replik")
+        old.broadcast()
+        self.assertIsNone(old._timer)
+        self.assertFalse(old._broadcast_pending)
+        self.assertIsNone(old._voice_queue)
+        self.assertIsInstance(rooms.get_room(old.code), TegnRoom)
+        rooms.get_room(old.code).close()