update

modules/models.py

@@ -47,7 +47,8 @@ def initialize_chat_tts():
 
 def load_chat_tts():
     if chat_tts is None:
-        load_chat_tts_in_thread()
+        with lock:
+            load_chat_tts_in_thread()
     if chat_tts is None:
         raise Exception("Failed to load ChatTTS models")
     return chat_tts