diff --git a/app/controllers/exercises_controller.rb b/app/controllers/exercises_controller.rb
index 5afb4f77..ccd7180a 100644
--- a/app/controllers/exercises_controller.rb
+++ b/app/controllers/exercises_controller.rb
@@ -184,8 +184,10 @@ class ExercisesController < ApplicationController
   end
 
   def set_course_token
-    if @lti_parameters
-      lti_json = @lti_parameters.lti_parameters[:lis_outcome_service_url]
+    lti_parameters = LtiParameter.find_by(external_users_id: current_user.id,
+                                          exercises_id: @exercise.id)
+    if lti_parameters
+      lti_json = lti_parameters.lti_parameters[:lis_outcome_service_url]
       @course_token =
           if match = lti_json.match(/^.*courses\/([a-z0-9\-]+)\/sections/)
             match.captures.first