diff --git a/model.py b/model.py
index 1bb20dbd..e398c3ba 100644
--- a/model.py
+++ b/model.py
@@ -253,6 +253,9 @@ class Model:
         return False
 
     def startMicTranscript(self, fnc):
+        if config.CHOICE_MIC_HOST == "None" or config.CHOICE_MIC_DEVICE == "None":
+            return
+
         mic_audio_queue = Queue()
         device = [device for device in getInputDevices()[config.CHOICE_MIC_HOST] if device["name"] == config.CHOICE_MIC_DEVICE][0]
         record_timeout = config.INPUT_MIC_RECORD_TIMEOUT
@@ -294,6 +297,9 @@ class Model:
             self.mic_audio_recorder = None
 
     def startCheckMicEnergy(self, fnc):
+        if config.CHOICE_MIC_HOST == "None" or config.CHOICE_MIC_DEVICE == "None":
+            return
+
         def sendMicEnergy():
             if mic_energy_queue.empty() is False:
                 energy = mic_energy_queue.get()
@@ -320,6 +326,8 @@ class Model:
             self.mic_energy_recorder = None
 
     def startSpeakerTranscript(self, fnc):
+        if config.CHOICE_SPEAKER_DEVICE == "None":
+            return
         spk_audio_queue = Queue()
         spk_device = [device for device in getOutputDevices() if device["name"] == config.CHOICE_SPEAKER_DEVICE][0]
 
@@ -362,6 +370,9 @@ class Model:
             self.spk_audio_recorder = None
 
     def startCheckSpeakerEnergy(self, fnc):
+        if config.CHOICE_SPEAKER_DEVICE == "None":
+            return
+
         def sendSpeakerEnergy():
             if speaker_energy_queue.empty() is False:
                 energy = speaker_energy_queue.get()
diff --git a/models/transcription/transcription_utils.py b/models/transcription/transcription_utils.py
index 4c72a8fa..522cb7a2 100644
--- a/models/transcription/transcription_utils.py
+++ b/models/transcription/transcription_utils.py
@@ -12,6 +12,8 @@ def getInputDevices():
                         devices[host["name"]].append(device)
                     else:
                         devices[host["name"]] = [device]
+    if len(devices) == 0:
+        devices = {"None": [{"name": "None"}]}
     return devices
 
 def getOutputDevices():
@@ -21,6 +23,8 @@ def getOutputDevices():
         for device in p.get_loopback_device_info_generator():
             if device["hostApi"] == wasapi_info["index"] and device["isLoopbackDevice"] is True:
                 devices.append(device)
+    if len(devices) == 0:
+        devices = [{'name':"None"}]
     return devices
 
 def getDefaultInputDevice():
@@ -33,7 +37,8 @@ def getDefaultInputDevice():
             for device_index in range(0, p. get_host_api_info_by_index(host_index)['deviceCount']):
                 device = p.get_device_info_by_host_api_device_index(host_index, device_index)
                 if device["index"] == defaultInputDevice:
-                    return {"host":host, "device": device}
+                    return {"host": host, "device": device}
+    return {"host": {"name": "None"}, "device": {"name": "None"}}
 
 def getDefaultOutputDevice():
     with PyAudio() as p:
@@ -49,4 +54,5 @@ def getDefaultOutputDevice():
                         for loopback in p.get_loopback_device_info_generator():
                             if default_speakers["name"] in loopback["name"]:
                                 default_device = loopback
-                                return default_device
\ No newline at end of file
+                                return default_device
+    return {"name":"None"}
\ No newline at end of file