Index: lnt/server/ui/views.py
===================================================================
--- lnt/server/ui/views.py
+++ lnt/server/ui/views.py
@@ -643,7 +644,7 @@
     if not base:
         return abort(404)
     flash("Baseline set to " + base.name, FLASH_SUCCESS)
-    flask.session[baseline_key()] = id
+    flask.session[baseline_key()] = base.order_id
 
     return redirect(get_redirect_target())