diff --git a/custom_components/dashboard_delbrueck/sensor.py b/custom_components/dashboard_delbrueck/sensor.py
index ee70933..2bfc882 100644
--- a/custom_components/dashboard_delbrueck/sensor.py
+++ b/custom_components/dashboard_delbrueck/sensor.py
@@ -73,7 +73,9 @@ def update(self):
             else:
                 self._attr_native_value = data["value"]
                 self._attr_native_unit_of_measurement = UNIT_CONVERTER[data["unit"]]
-        except (ValueError, ConnectionError):
+        except ConnectionError:
+            self._attr_native_value = None
+        except ValueError:
             self._attr_native_value = None
             if "unit" in data and data["unit"] in UNIT_CONVERTER:
                 self._attr_native_unit_of_measurement = UNIT_CONVERTER[data["unit"]]