diff --git a/packages/control/consumer/consumer.py b/packages/control/consumer/consumer.py
index 035a5eec03..ac49b70def 100644
--- a/packages/control/consumer/consumer.py
+++ b/packages/control/consumer/consumer.py
@@ -109,7 +109,7 @@ def get_parameter(self) -> Tuple[float, float, Optional[str], Optional[Chargemod
             log.debug("Intervall für neuen Schaltbefehl nicht abgelaufen.")
             return (0,
                     0,
-                    self.data.set.state_str_prev,
+                    None,
                     self.data.control_parameter.chargemode,
                     self.data.control_parameter.submode)
 
diff --git a/packages/control/consumer/consumer_test.py b/packages/control/consumer/consumer_test.py
index 9f229a26b4..357ca48167 100644
--- a/packages/control/consumer/consumer_test.py
+++ b/packages/control/consumer/consumer_test.py
@@ -36,6 +36,18 @@ def consumer() -> Consumer:
     return load
 
 
+def test_get_parameter_clears_previous_state_string_when_switch_interval_is_active(consumer: Consumer):
+    # setup
+    consumer.data.set.switch_interval_elapsed = False
+    consumer.data.set.state_str_prev = "previous state"
+
+    # execution
+    _, _, state_string, _, _ = consumer.get_parameter()
+
+    # evaluation
+    assert state_string is None
+
+
 @pytest.mark.parametrize(
     ("wait_for_start_active",
      "state", "currents",