diff --git a/packages/control/consumer/consumer.py b/packages/control/consumer/consumer.py
index 35fe38de03..0134bed4c3 100644
--- a/packages/control/consumer/consumer.py
+++ b/packages/control/consumer/consumer.py
@@ -91,6 +91,8 @@ def process_on_time(self):
                 self.data.set.timestamp_wrote_last_on_time = now
             self.data.set.on_time += now - self.data.set.timestamp_wrote_last_on_time
             self.data.set.timestamp_wrote_last_on_time = now
+        else:
+            self.data.set.timestamp_wrote_last_on_time = None
 
     def reset_on_time(self):
         self.data.set.on_time = 0
diff --git a/packages/control/consumer/consumer_test.py b/packages/control/consumer/consumer_test.py
index 1ed387eeef..a871b55f38 100644
--- a/packages/control/consumer/consumer_test.py
+++ b/packages/control/consumer/consumer_test.py
@@ -182,6 +182,26 @@ def test_wait_for_start_handler_standby_threshold_depends_on_usage_type(
     assert charging_func.call_count == 0
 
 
+def test_process_on_time_pauses_when_charge_state_is_false(
+        consumer: Consumer,
+        monkeypatch: pytest.MonkeyPatch):
+    # setup
+    monkeypatch.setattr(timecheck, "create_timestamp", Mock(side_effect=[100, 130, 160]))
+
+    # execution
+    consumer.data.get.charge_state = True
+    consumer.process_on_time()  # Start bei t=100
+    consumer.data.get.charge_state = False
+    consumer.process_on_time()  # Pause: Zeitstempel wird verworfen
+    consumer.data.get.charge_state = True
+    consumer.process_on_time()  # Neustart bei t=130 ohne Nachlauf aus Pause
+    consumer.process_on_time()  # Laufzeit von 30s wird gezaehlt
+
+    # evaluation
+    assert consumer.data.set.on_time == 30
+    assert consumer.data.set.timestamp_wrote_last_on_time == 160
+
+
 @pytest.mark.parametrize(
     "plans, plan_found, expected",
     [