diff --git a/custom_components/ds_air/ds_air_service/dao.py b/custom_components/ds_air/ds_air_service/dao.py
index 6fc6dd1..d1076e0 100644
--- a/custom_components/ds_air/ds_air_service/dao.py
+++ b/custom_components/ds_air/ds_air_service/dao.py
@@ -89,6 +89,8 @@ class Sensor(Device):
                    "humidity_lower", "pm25_upper", "pm25_lower", "co2_upper", "co2_lower", "voc_lower", "tvoc_upper",
                    "hcho_upper", "connected", "sleep_mode_count", "time_millis"]
 
+    UNINITIALIZED_VALUE = -1000
+
     def __init__(self):
         Device.__init__(self)
         self.mac: str = ''
diff --git a/custom_components/ds_air/ds_air_service/decoder.py b/custom_components/ds_air/ds_air_service/decoder.py
index d49d180..fbba110 100644
--- a/custom_components/ds_air/ds_air_service/decoder.py
+++ b/custom_components/ds_air/ds_air_service/decoder.py
@@ -185,24 +185,24 @@ def load_bytes(self, b):
             sensor.name = sensor.alias
             sensor.type1 = d.read1()
             sensor.type2 = d.read1()
-            humidity = -10000
-            hcho = -1000
-            temp = -1000
+            humidity = Sensor.UNINITIALIZED_VALUE
+            hcho = Sensor.UNINITIALIZED_VALUE
+            temp = Sensor.UNINITIALIZED_VALUE
             if (sensor.type1 & 1) == 1:
                 temp = d.read2()
             if ((sensor.type1 >> 1) & 1) == 1:
                 humidity = d.read2()
-            pm25 = -1000
+            pm25 = Sensor.UNINITIALIZED_VALUE
             if (sensor.type1 >> 2) & 1 == 1:
                 pm25 = d.read2()
-            co2 = -1000
+            co2 = Sensor.UNINITIALIZED_VALUE
             if (sensor.type1 >> 3) & 1 == 1:
                 co2 = d.read2()
             voc = EnumSensor.Voc.STEP_UNUSE
             if (sensor.type1 >> 4) & 1 == 1:
                 f = d.read1()
                 voc = EnumSensor.Voc(f)
-            tvoc = -1000
+            tvoc = Sensor.UNINITIALIZED_VALUE
             if (sensor.type1 >> 5) & 1 == 1:
                 tvoc = d.read2()
             if (sensor.type1 >> 6) & 1 == 1:
diff --git a/custom_components/ds_air/ds_air_service/service.py b/custom_components/ds_air/ds_air_service/service.py
index 677d74a..b55c854 100644
--- a/custom_components/ds_air/ds_air_service/service.py
+++ b/custom_components/ds_air/ds_air_service/service.py
@@ -121,8 +121,6 @@ def run(self) -> None:
             if cnt == 5:
                 cnt = 0
                 Service.poll_status()
-            p = Sensor2InfoParam()
-            Service.send_msg(p)
             time.sleep(60)
 
 
@@ -274,7 +272,6 @@ def set_sensors_status(sensors: typing.List[Sensor]):
                         func(newSensor)
                     except Exception as e:
                         _log(str(e))
-                    break
 
     @staticmethod
     def poll_status():
diff --git a/custom_components/ds_air/manifest.json b/custom_components/ds_air/manifest.json
index 1704a6c..5bf5388 100644
--- a/custom_components/ds_air/manifest.json
+++ b/custom_components/ds_air/manifest.json
@@ -5,6 +5,6 @@
   "dependencies": [],
   "codeowners": [],
   "requirements": [],
-  "version": "1.2.0",
+  "version": "1.2.1",
   "config_flow": true
 }
diff --git a/custom_components/ds_air/sensor.py b/custom_components/ds_air/sensor.py
index 6a8e700..ceff5fd 100644
--- a/custom_components/ds_air/sensor.py
+++ b/custom_components/ds_air/sensor.py
@@ -96,7 +96,8 @@ def state(self):
     def parse_data(self, device: Sensor, not_update: bool = False):
         """Parse data sent by gateway."""
         self._is_available = device.connected and device.switch_on_off
-        self._state = getattr(device, self._data_key) / SENSOR_TYPES.get(self._data_key)[3]
+        if Sensor.UNINITIALIZED_VALUE != getattr(device, self._data_key):
+            self._state = getattr(device, self._data_key) / SENSOR_TYPES.get(self._data_key)[3]
         if not not_update:
             self.schedule_update_ha_state()
         return True