diff --git a/hikvision-doorbell/src/mqtt.py b/hikvision-doorbell/src/mqtt.py
index 4af6803..12f95b5 100644
--- a/hikvision-doorbell/src/mqtt.py
+++ b/hikvision-doorbell/src/mqtt.py
@@ -222,7 +222,9 @@ async def video_intercom_alarm(
             alarm_info: NET_DVR_VIDEO_INTERCOM_ALARM,
             buffer_length,
             user_pointer: c_void_p):
-        call_sensor = cast(Sensor, self._sensors[doorbell]['call'])
+        
+        if not doorbell._type is DeviceType.INDOOR:
+            call_sensor = cast(Sensor, self._sensors[doorbell]['call'])
 
         # Extract the type of alarm as a Python enum
         try: