diff --git a/server/voice_changer/VoiceChangerManager.py b/server/voice_changer/VoiceChangerManager.py
index 05c2b872..f2c725f5 100644
--- a/server/voice_changer/VoiceChangerManager.py
+++ b/server/voice_changer/VoiceChangerManager.py
@@ -234,7 +234,8 @@ class VoiceChangerManager(ServerDeviceCallbacks):
             self.voiceChanger.setModel(self.voiceChangerModel)
         else:
             print(f"[Voice Changer] unknown voice changer model: {slotInfo.voiceChangerType}")
-            del self.voiceChangerModel
+            if hasattr(self, "voiceChangerModel"):
+                del self.voiceChangerModel
             return
 
     def update_settings(self, key: str, val: str | int | float):