Update app.py

app.py

@@ -32,6 +32,8 @@ def run_model(input_ids, model, max_new_tokens, top_p, top_k, temperature, repet
 
 def generate_text(mode: str, message: str, chat_history: List[Tuple[str, str]], max_new_tokens: int = DEFAULT_MAX_NEW_TOKENS,
                   temperature: float = 0.6, top_p: float = 0.7, top_k: int = 20, repetition_penalty: float = 1.0) -> Iterator[str]:
+    if chat_history is None:
+        chat_history = [] 
     conversation = [{"role": "user", "content": user} for user, _ in chat_history]
     conversation.extend([{"role": "assistant", "content": assistant} for _, assistant in chat_history])
     conversation.append({"role": "user", "content": message})