diff --git a/app/assets/javascripts/editor/editor.js.erb b/app/assets/javascripts/editor/editor.js.erb
index 3ac57856..7de058d5 100644
--- a/app/assets/javascripts/editor/editor.js.erb
+++ b/app/assets/javascripts/editor/editor.js.erb
@@ -377,7 +377,7 @@ var CodeOceanEditor = {
 
 
     initializeWorkspaceButtons: function () {
-        $('#submit').on('click', this.submitCode.bind(this));
+        $('#submit').one('click', this.submitCode.bind(this));
         $('#assess').on('click', this.scoreCode.bind(this));
         $('#dropdown-render, #render').on('click', this.renderCode.bind(this));
         $('#dropdown-run, #run').on('click', this.runCode.bind(this));
diff --git a/app/assets/javascripts/error_templates.js b/app/assets/javascripts/error_templates.js
index 74978157..3cb7dcaf 100644
--- a/app/assets/javascripts/error_templates.js
+++ b/app/assets/javascripts/error_templates.js
@@ -1,7 +1,7 @@
 $(document).on('turbolinks:load', function() {
     if ($.isController('error_templates')) {
         $('#add-attribute').find('button').on('click', function () {
-            $.ajax(location + '/attribute.json', {
+            $.ajax('//' + location.host + location.pathname + '/attribute.json', {
                 method: 'POST',
                 data: {
                     _method: 'PUT',
diff --git a/app/assets/javascripts/external_users.js b/app/assets/javascripts/external_users.js
index 058fdfa0..402c5473 100644
--- a/app/assets/javascripts/external_users.js
+++ b/app/assets/javascripts/external_users.js
@@ -17,7 +17,7 @@ $(document).on('turbolinks:load', function() {
         </a>';
     };
 
-    var jqxhr = $.ajax(window.location.href + '/tag_statistics', {
+    var jqxhr = $.ajax('//' + location.host + location.pathname + '/tag_statistics', {
       dataType: 'json',
       method: 'GET'
     });
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 24775794..e2023421 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -13,7 +13,7 @@ class ApplicationController < ActionController::Base
 
   def current_user
     ::NewRelic::Agent.add_custom_attributes(external_user_id: session[:external_user_id], session_user_id: session[:user_id])
-    @current_user ||= ExternalUser.find_by(id: session[:external_user_id]) || login_from_session || login_from_other_sources
+    @current_user ||= ExternalUser.find_by(id: session[:external_user_id]) || login_from_session || login_from_other_sources || nil
   end
 
   def require_user!
diff --git a/app/controllers/concerns/submission_scoring.rb b/app/controllers/concerns/submission_scoring.rb
index 6c258a5a..9bf9cda3 100644
--- a/app/controllers/concerns/submission_scoring.rb
+++ b/app/controllers/concerns/submission_scoring.rb
@@ -88,7 +88,7 @@ module SubmissionScoring
     # Return all test results except for those of a linter if not allowed
     show_linter = Python20CourseWeek.show_linter? submission.exercise, submission.user_id
     outputs&.reject do |output|
-      next if show_linter
+      next if show_linter || output.blank?
 
       output[:file_role] == 'teacher_defined_linter'
     end
diff --git a/app/controllers/request_for_comments_controller.rb b/app/controllers/request_for_comments_controller.rb
index 196fcf01..9b55c9e3 100644
--- a/app/controllers/request_for_comments_controller.rb
+++ b/app/controllers/request_for_comments_controller.rb
@@ -2,7 +2,7 @@ class RequestForCommentsController < ApplicationController
   include SubmissionScoring
   before_action :set_request_for_comment, only: [:show, :edit, :update, :destroy, :mark_as_solved, :set_thank_you_note]
 
-  skip_after_action :verify_authorized
+  before_action :require_user!
 
   def authorize!
     authorize(@request_for_comments || @request_for_comment)
@@ -26,11 +26,12 @@ class RequestForCommentsController < ApplicationController
   def get_my_comment_requests
     @search = RequestForComment
                   .with_last_activity
-                  .where(user_id: current_user.id)
+                  .where(user_id: current_user&.id)
                   .ransack(params[:q])
     @request_for_comments = @search.result
                                 .order('created_at DESC')
                                 .paginate(page: params[:page])
+    authorize!
     render 'index'
   end
 
@@ -44,6 +45,7 @@ class RequestForCommentsController < ApplicationController
     @request_for_comments = @search.result
                                 .order('last_comment DESC')
                                 .paginate(page: params[:page])
+    authorize!
     render 'index'
   end
 
@@ -83,10 +85,6 @@ class RequestForCommentsController < ApplicationController
     authorize!
   end
 
-  # GET /request_for_comments/1/edit
-  def edit
-  end
-
   # POST /request_for_comments.json
   def create
     # Consider all requests as JSON
@@ -111,17 +109,6 @@ class RequestForCommentsController < ApplicationController
     authorize!
   end
 
-  # DELETE /request_for_comments/1
-  # DELETE /request_for_comments/1.json
-  def destroy
-    @request_for_comment.destroy
-    respond_to do |format|
-      format.html { redirect_to request_for_comments_url, notice: 'Request for comment was successfully destroyed.' }
-      format.json { head :no_content }
-    end
-    authorize!
-  end
-
   private
     # Use callbacks to share common setup or constraints between actions.
   def set_request_for_comment
diff --git a/app/controllers/sessions_controller.rb b/app/controllers/sessions_controller.rb
index 059c1888..145c3fd8 100644
--- a/app/controllers/sessions_controller.rb
+++ b/app/controllers/sessions_controller.rb
@@ -30,7 +30,7 @@ class SessionsController < ApplicationController
   end
 
   def destroy
-    if current_user.external_user?
+    if current_user&.external_user?
       clear_lti_session_data
     else
       logout
diff --git a/app/controllers/submissions_controller.rb b/app/controllers/submissions_controller.rb
index d1f9361b..7035de30 100644
--- a/app/controllers/submissions_controller.rb
+++ b/app/controllers/submissions_controller.rb
@@ -8,8 +8,8 @@ class SubmissionsController < ApplicationController
 
   before_action :set_submission, only: [:download, :download_file, :render_file, :run, :score, :extract_errors, :show, :statistics, :stop, :test]
   before_action :set_docker_client, only: [:run, :test]
-  before_action :set_files, only: [:download, :download_file, :render_file, :show]
-  before_action :set_file, only: [:download_file, :render_file]
+  before_action :set_files, only: [:download, :download_file, :render_file, :show, :run]
+  before_action :set_file, only: [:download_file, :render_file, :run]
   before_action :set_mime_type, only: [:download_file, :render_file]
   skip_before_action :verify_authenticity_token, only: [:download_file, :render_file]
 
diff --git a/app/controllers/user_exercise_feedbacks_controller.rb b/app/controllers/user_exercise_feedbacks_controller.rb
index 1d8293c5..9330f604 100644
--- a/app/controllers/user_exercise_feedbacks_controller.rb
+++ b/app/controllers/user_exercise_feedbacks_controller.rb
@@ -20,6 +20,8 @@ class UserExerciseFeedbacksController < ApplicationController
   end
 
   def create
+    Raven.extra_context(params: uef_params)
+
     @exercise = Exercise.find(uef_params[:exercise_id])
     rfc = RequestForComment.unsolved.where(exercise_id: @exercise.id, user_id: current_user.id).first
     submission = current_user.submissions.where(exercise_id: @exercise.id).order('created_at DESC').first rescue nil
diff --git a/app/models/proxy_exercise.rb b/app/models/proxy_exercise.rb
index bb17b30a..96c143b7 100644
--- a/app/models/proxy_exercise.rb
+++ b/app/models/proxy_exercise.rb
@@ -171,6 +171,8 @@ class ProxyExercise < ApplicationRecord
       if points_ratio == 0.0
         Rails.logger.debug("scoring user #{user.id} for exercise #{ex.id}: points_ratio=#{points_ratio} score: 0" )
         return 0.0
+      elsif points_ratio > 1.0
+        points_ratio = 1.0 # The score of the exercise was adjusted and is now lower than it was
       end
       points_ratio_index = ((scoring_matrix.size - 1)  * points_ratio).to_i
       working_time_user = ex.accumulated_working_time_for_only(user)
diff --git a/app/views/request_for_comments/show.html.slim b/app/views/request_for_comments/show.html.slim
index d5cca4a3..6a9db128 100644
--- a/app/views/request_for_comments/show.html.slim
+++ b/app/views/request_for_comments/show.html.slim
@@ -55,7 +55,7 @@
 
         - assess_runs = testruns.select {|run| run.cause == 'assess' }
         - unless @current_user.admin?
-          - assess_runs = assess_runs.select {|run| run.file.teacher_defined_test? }
+          - assess_runs = assess_runs.select {|run| run.file&.teacher_defined_test? || true }
         - if assess_runs.size > 0
           h5.mt-4= t('request_for_comments.test_results')
           .testrun-assess-results
@@ -109,7 +109,7 @@ javascript:
     $.ajax({
       dataType: 'json',
       method: 'GET',
-      url: location + '/mark_as_solved'
+      url: '//' + location.host + location.pathname + '/mark_as_solved'
     }).done(function(response){
       if(response.solved){
         solvedButton.removeClass('btn-primary');
@@ -127,7 +127,7 @@ javascript:
       $.ajax({
         dataType: 'json',
         method: 'POST',
-        url: location + '/set_thank_you_note',
+        url: '//' + location.host + location.pathname + '/set_thank_you_note',
         data: {
             note: value
         }
diff --git a/app/views/submissions/index.html.slim b/app/views/submissions/index.html.slim
index cff0eef5..3b922b82 100644
--- a/app/views/submissions/index.html.slim
+++ b/app/views/submissions/index.html.slim
@@ -22,12 +22,12 @@ h1 = Submission.model_name.human(count: 2)
     tbody
       - @submissions.each do |submission|
         tr
-          td = link_to_if(policy(submission.exercise).show?, submission.exercise, submission.exercise)
+          td = link_to_if(submission.exercise && policy(submission.exercise).show?, submission.exercise, submission.exercise)
           td = link_to_if(policy(submission.user).show?, submission.user, submission.user)
           td = t("submissions.causes.#{submission.cause}")
           td = submission.score
           td = l(submission.created_at, format: :short)
-          td = link_to(t('shared.show'), submission) if policy(submission).show?
+          td = link_to(t('shared.show'), submission) if policy(submission).show? && submission.exercise
           td = link_to(t('shared.statistics'), statistics_submission_path(submission)) if policy(submission).statistics?
 
 = render('shared/pagination', collection: @submissions)
diff --git a/config/initializers/raven.rb b/config/initializers/raven.rb
index f4323bfd..9beeb87a 100644
--- a/config/initializers/raven.rb
+++ b/config/initializers/raven.rb
@@ -8,6 +8,8 @@ Rails.application.tap do |app|
   Raven.configure do |config|
     config.sanitize_fields = app.config.filter_parameters.map(&:to_s)
 
+    config.processors -= [Raven::Processor::PostData] # Do this to send POST data
+
     config.async = lambda do |event|
       pool.post { ::Raven.send_event(event) }
     end
diff --git a/config/routes.rb b/config/routes.rb
index 9c9584d8..df1a8b5b 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -14,7 +14,7 @@ Rails.application.routes.draw do
     end
   end
   resources :codeharbor_links, only: %i[new create edit update destroy]
-  resources :request_for_comments do
+  resources :request_for_comments, except: %i[edit destroy] do
     member do
       get :mark_as_solved, defaults: { format: :json }
       post :set_thank_you_note, defaults: { format: :json }