diff --git a/app/views/user_mailer/exercise_anomaly_detected.html.slim b/app/views/user_mailer/exercise_anomaly_detected.html.slim
index 4384a30b..9b0835da 100644
--- a/app/views/user_mailer/exercise_anomaly_detected.html.slim
+++ b/app/views/user_mailer/exercise_anomaly_detected.html.slim
@@ -12,9 +12,9 @@ table(border=1)
     - @anomalies.keys.each do | id |
       - exercise = Exercise.find(id)
       tr
-        td = link_to_if(policy(@user, exercise).show?, exercise.title, exercise_path(exercise))
+        td = link_to_if(ExercisePolicy.new(@user, exercise).show?, exercise.title, exercise_url(exercise))
         td = @anomalies[id]
-        td = link_to_if(policy(@user, exercise).statistics?, t('shared.statistics', locale: :de), statistics_exercise_path(exercise))
+        td = link_to_if(ExercisePolicy.new(@user, exercise).statistics?, t('shared.statistics', locale: :de), statistics_exercise_url(exercise))
 
 
 == t('mailers.user_mailer.exercise_anomaly_detected.body2',
@@ -31,8 +31,8 @@ table(border=1)
     - @anomalies.keys.each do | id |
       - exercise = Exercise.find(id)
       tr
-        td = link_to_if(policy(@user, exercise).show?, exercise.title, exercise_path(exercise))
+        td = link_to_if(ExercisePolicy.new(@user, exercise).show?, exercise.title, exercise_url(exercise))
         td = @anomalies[id]
-        td = link_to_if(policy(@user, exercise).statistics?, t('shared.statistics', locale: :en), statistics_exercise_path(exercise))
+        td = link_to_if(ExercisePolicy.new(@user, exercise).statistics?, t('shared.statistics', locale: :en), statistics_exercise_url(exercise))
 
 == t('mailers.user_mailer.exercise_anomaly_detected.body3')
diff --git a/lib/tasks/detect_exercise_anomalies.rake b/lib/tasks/detect_exercise_anomalies.rake
index 1e710534..1a1b0787 100644
--- a/lib/tasks/detect_exercise_anomalies.rake
+++ b/lib/tasks/detect_exercise_anomalies.rake
@@ -1,6 +1,4 @@
-# TODO: Identify how the following line influences our tests:
-# https://github.com/openHPI/codeocean/pull/345#issuecomment-509706348
-include Rails.application.routes.url_helpers
+# frozen_string_literal: true
 
 namespace :detect_exercise_anomalies do
   # uncomment for debug logging:
@@ -63,7 +61,7 @@ namespace :detect_exercise_anomalies do
                                from exercises e
                                  join submissions s on s.exercise_id = e.id
                                group by e.id
-                               having count(s.user_id) > #{ExerciseCollection.sanitize(number_of_solutions)}
+                               having count(s.user_id) > #{ExerciseCollection.sanitize_sql(number_of_solutions)}
                               ) as exercises_with_submissions on exercises_with_submissions.id = eci.exercise_id")
       .group('exercise_collections.id')
       .having('count(exercises_with_submissions.id) > ?', number_of_exercises)
@@ -140,7 +138,7 @@ namespace :detect_exercise_anomalies do
       users_to_notify.each do |u|
         user = u[:user_type] == InternalUser.name ? InternalUser.find(u[:user_id]) : ExternalUser.find(u[:user_id])
         host = CodeOcean::Application.config.action_mailer.default_url_options[:host]
-        feedback_link = url_for(action: :new, controller: :user_exercise_feedbacks, exercise_id: exercise.id, host: host)
+        feedback_link = Rails.application.routes.url_helpers.url_for(action: :new, controller: :user_exercise_feedbacks, exercise_id: exercise.id, host: host)
         UserMailer.exercise_anomaly_needs_feedback(user, exercise, feedback_link).deliver
       end
       log("Asked #{users_to_notify.size} users for feedback.", 2)