Update app.py

app.py

@@ -31,10 +31,15 @@ GREETING_MESSAGES = [
 
 def user(user_message, history):
     """Add user message to chat history."""
+    if history is None:
+        history = []
     return "", history + [{"role": "user", "content": user_message}]
 
 def bot(history):
     """Generate and stream the bot's response."""
+    if not history:
+        history = []
+        
     # Prepare the messages for the model
     messages = [
         {
@@ -67,6 +72,10 @@ def bot(history):
             history[-1]["content"] += chunk["choices"][0]["delta"]["content"]
             yield history
 
+def initial_greeting():
+    """Return properly formatted initial greeting."""
+    return [{"role": "assistant", "content": random.choice(GREETING_MESSAGES)}]
+
 # Custom CSS for a space theme
 custom_css = """
 #component-0 {
@@ -148,12 +157,7 @@ with gr.Blocks(css=custom_css, theme=gr.themes.Soft(primary_hue="indigo", neutra
     clear.click(lambda: None, None, chatbot, queue=False)
     
     # Initial greeting
-    demo.load(
-        lambda: [[{"role": "assistant", "content": random.choice(GREETING_MESSAGES)}]],
-        None,
-        chatbot,
-        queue=False
-    )
+    demo.load(initial_greeting, None, chatbot, queue=False)
 
 # Launch the app
 if __name__ == "__main__":