Update app.py

app.py

@@ -92,6 +92,8 @@ def Page():
                 rv.Card(flat=True,children=[Message(message) for message in messages.value])
             with ColumnLayout():
                 InputText()
-            with ColumnLayout():
-                solara.Button("Logout", icon_name="mdi-logout", href=auth.get_logout_url())
+
+            if auth.user.value:
+                with ColumnLayout():
+                    solara.Button("Logout", icon_name="mdi-logout", href=auth.get_logout_url())
 Page()