diff --git a/src/Bundle/ChillPersonBundle/Controller/AccompanyingCourseController.php b/src/Bundle/ChillPersonBundle/Controller/AccompanyingCourseController.php
index c9b9cee35..43c516ca9 100644
--- a/src/Bundle/ChillPersonBundle/Controller/AccompanyingCourseController.php
+++ b/src/Bundle/ChillPersonBundle/Controller/AccompanyingCourseController.php
@@ -183,6 +183,11 @@ class AccompanyingCourseController extends Controller
             $workflow = $this->registry->get($accompanyingCourse);
 
             if ($workflow->can($accompanyingCourse, 'close')) {
+                $errors = $this->validator->validate($accompanyingCourse, null, [$accompanyingCourse::STEP_CLOSED]);
+                if( count($errors) > 0 ){
+                    return $this->json($errors, 422);
+                }
+
                 $workflow->apply($accompanyingCourse, 'close');
             }