Update app.py

app.py

@@ -25,7 +25,8 @@ class GUI:
                     welcome_md = gr.Markdown()
                 with gr.Column(scale=1):
                     login_btn = gr.LoginButton()
-                    logout_btn = gr.LogoutButton()
+                    if profile is not None:
+                        logout_btn = gr.LogoutButton()
             
             # API Key input section (shown after login)
             api_key_section = gr.Column(visible=False)