diff --git a/apps/ad_toolbox b/apps/ad_toolbox
index 1a148d4..54c525c 160000
--- a/apps/ad_toolbox
+++ b/apps/ad_toolbox
@@ -1 +1 @@
-Subproject commit 1a148d4e3fd4ac2e343c46913f5504405a6029d8
+Subproject commit 54c525c8432c18d49b1e54bfb7220dac6dd8242b
diff --git a/apps/vertex2.py b/apps/vertex2.py
index f83a931..2c45e0b 100644
--- a/apps/vertex2.py
+++ b/apps/vertex2.py
@@ -358,7 +358,7 @@ class Vertex2(SmartObject):
             return
         with self._spam_lock:
             if self._spam_timer is not None:
-                self.cancel_timer(self._spam_timer)
+                self.cancel_timer(self._spam_timer, silent=True)
             self._spam_timer = None
             self._spam_deadline = None
             self._spam_last_interrupt = None
@@ -399,7 +399,7 @@ class Vertex2(SmartObject):
             if self.no_signal_spam_sensor.get_state() != state:
                 self.no_signal_spam_sensor.set_state(state=state)
             if self._spam_timer is not None:
-                self.cancel_timer(self._spam_timer)
+                self.cancel_timer(self._spam_timer, silent=True)
             self._spam_deadline = at + 4
             self._spam_timer = self.run_in(
                 self._expire_no_signal_spam, max(0, self._spam_deadline - now),
@@ -553,7 +553,7 @@ class Vertex2(SmartObject):
             with processing_lock:
                 self._command_processing_deadline = None
                 if self._command_processing_handle is not None:
-                    self.cancel_timer(self._command_processing_handle)
+                    self.cancel_timer(self._command_processing_handle, silent=True)
                     self._command_processing_handle = None
 
     def terminate(self):
@@ -735,7 +735,7 @@ class Vertex2(SmartObject):
         with self._command_processing_lock:
             self._command_processing_deadline = None
             if self._command_processing_handle is not None:
-                self.cancel_timer(self._command_processing_handle)
+                self.cancel_timer(self._command_processing_handle, silent=True)
                 self._command_processing_handle = None
             if self.command_processing_sensor is not None:
                 self.command_processing_sensor.set_state(state='off')
@@ -767,7 +767,7 @@ class Vertex2(SmartObject):
             if only_if_active and self._command_processing_deadline is None:
                 return
             if self._command_processing_handle is not None:
-                self.cancel_timer(self._command_processing_handle)
+                self.cancel_timer(self._command_processing_handle, silent=True)
             self._command_processing_deadline = time.monotonic() + self.command_processing_timeout
             if self.command_processing_sensor.get_state() != 'on':
                 self.command_processing_sensor.set_state(state='on')
diff --git a/tests/test_vertex2.py b/tests/test_vertex2.py
index 52b26f4..eabc3ad 100644
--- a/tests/test_vertex2.py
+++ b/tests/test_vertex2.py
@@ -65,7 +65,7 @@ class PowerTests(unittest.TestCase):
         connection.shutdown.assert_called_once_with(socket.SHUT_RDWR)
         app.turn_off.assert_called_once_with('switch.vertex2')
         self.assertFalse(app._vertex2_powered())
-        app.cancel_timer.assert_called_once_with('timer')
+        app.cancel_timer.assert_called_once_with('timer', silent=True)
         self.assertIsNone(app._command_processing_deadline)
         app.command_processing_sensor.set_state.assert_called_once_with(state='off')
         app.unreachable_sensor.set_state.assert_called_once_with(state='off')
@@ -486,8 +486,8 @@ class SpamSensorTests(unittest.TestCase):
         self.assertTrue(app._interrupt_stop.is_set())
         self.assertIsNone(app._spam_timer)
         self.assertIsNone(app._spam_deadline)
-        app.cancel_timer.assert_any_call('spam_timer')
-        app.cancel_timer.assert_any_call('timer')
+        app.cancel_timer.assert_any_call('spam_timer', silent=True)
+        app.cancel_timer.assert_any_call('timer', silent=True)
         app.no_signal_spam_sensor.set_state.assert_not_called()
         # An already queued expiry callback must also leave the state alone.
         app._expire_no_signal_spam({'deadline': 110})