Update app.py

app.py

@@ -318,7 +318,7 @@ with gr.Blocks(theme=theme, css=css) as demo:  # Suppression de 'css=css' si 'cs
     </div>
     """)
     with gr.Column(elem_id="chat-interface"):
-        chat = gr.Chatbot(elem_id="chat-messages", show_label=False, avatar_images=[user_profile_image,bot_profile_image],value=[["","Ask anything about medicine / scientific research !"]]) 
+        chat = gr.Chatbot(elem_id="chat-messages", show_label=False, avatar_images=[user_profile_image,bot_profile_image],value=[[None,"Ask anything about medicine / scientific research !"]]) 
         with gr.Row(elem_id="suggestions"):
             sugg1 = gr.Button(suggestion[0], elem_classes="suggestion-btn").click(
                 suggestion1, inputs=[chat], outputs=[chat]