diff --git a/app/controllers/exercises_controller.rb b/app/controllers/exercises_controller.rb
index e197ee92..ef627c63 100644
--- a/app/controllers/exercises_controller.rb
+++ b/app/controllers/exercises_controller.rb
@@ -443,6 +443,7 @@ class ExercisesController < ApplicationController
     if current_user.admin? || current_user.teacher?
       redirect_to(@exercise, alert: t('exercises.implement.unpublished')) if @exercise.unpublished?
       redirect_to(@exercise, alert: t('exercises.implement.no_files')) unless @exercise.files.visible.exists?
+      redirect_to(@exercise, alert: t('exercises.implement.no_execution_environment')) if @exercise.execution_environment.blank?
     else
       render_not_authorized
     end
diff --git a/app/policies/exercise_policy.rb b/app/policies/exercise_policy.rb
index 42bcf48c..f10c446a 100644
--- a/app/policies/exercise_policy.rb
+++ b/app/policies/exercise_policy.rb
@@ -31,7 +31,7 @@ class ExercisePolicy < AdminOrAuthorPolicy
 
   %i[implement? working_times? intervention? search? reload?].each do |action|
     define_method(action) do
-      return no_one unless @record.files.visible.exists?
+      return no_one unless @record.files.visible.exists? && @record.execution_environment.present?
 
       admin? || teacher_in_study_group? || author? || (everyone && !@record.unpublished?)
     end
diff --git a/config/locales/de.yml b/config/locales/de.yml
index b8ffdf25..80790d07 100644
--- a/config/locales/de.yml
+++ b/config/locales/de.yml
@@ -451,6 +451,7 @@ de:
       not_graded: ohne Punkte
       hint: Hinweis
       no_files: Die Aufgabe umfasst noch keine sichtbaren Dateien.
+      no_execution_environment: Für die Aufgabe wurde noch keine Ausführungsumgebung gewählt.
       no_output: Die letzte Code-Ausführung terminierte am %{timestamp} ohne Ausgabe.
       no_output_exit_successful: Die letzte Code-Ausführung terminierte am %{timestamp} ohne Ausgabe and wurde erfolgreich beendet (Statuscode %{exit_code}).
       no_output_exit_failure: Die letzte Code-Ausführung terminierte am %{timestamp} ohne Ausgabe und wurde mit einem Fehler beendet (Statuscode %{exit_code}).
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 9345245a..4aa44e7b 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -451,6 +451,7 @@ en:
       not_graded: not graded
       hint: Hint
       no_files: The exercise does not comprise visible files yet.
+      no_execution_environment: No execution environment has been selected for the exercise yet.
       no_output: The last code run finished on %{timestamp} without any output.
       no_output_exit_successful: The last code run finished on %{timestamp} without any output and exited successfully (status code %{exit_code}).
       no_output_exit_failure: The last code run finished on %{timestamp} without any output and exited with a failure (status code %{exit_code}).
@@ -464,7 +465,7 @@ en:
       results: Results
       start: Start Coding
       test_count: '<span class="number">%{count}</span> test files have been executed.'
-      unpublished: The selected exercises has been deactivated. Hence, you cannot implement this exercise at the moment.
+      unpublished: The selected exercise has been deactivated. Hence, you cannot implement this exercise at the moment.
       workspace: Workspace
       comment:
         a_comment: comment