diff --git a/courses/tasks.py b/courses/tasks.py
index 877bb36..7477419 100644
--- a/courses/tasks.py
+++ b/courses/tasks.py
@@ -9,5 +9,5 @@ def add_lesson(user_out_key: str, course_token: str, lesson_token: str, is_hm: b
     ProgressLesson.objects.get_or_create(
         progress=p,
         lesson_token=lesson_token,
-        checker=get_user_model().objects.get(out_key=(p.teacher if is_hm else user_out_key)),
+        checker=get_user_model().objects.get(out_key=(p.teacher.out_key if is_hm else user_out_key)),
     )
\ No newline at end of file