diff --git a/finance/signals.py b/finance/signals.py
index 6b88d88..300001d 100644
--- a/finance/signals.py
+++ b/finance/signals.py
@@ -1,3 +1,4 @@
+from django.contrib.auth import get_user_model
 from django.core.mail import EmailMessage
 from django.db.models.signals import pre_save, post_save
 from django.dispatch import receiver
@@ -29,10 +30,18 @@ def invoice_signal(instance, **kwargs):
 
     if instance.status == 'F':
         if instance.is_open:
-            Progress.objects.get_or_create(
-                course_token=instance.bill.course_token,
-                user=instance.bill.user,
-            )
+            try:
+                Progress.objects.get(
+                    course_token=instance.bill.course_token,
+                    user=instance.bill.user,
+                )
+            except Progress.DoesNotExist:
+                Progress.objects.create(
+                    course_token=instance.bill.course_token,
+                    user=instance.bill.user,
+                    teacher=get_user_model().objects.get(out_key=course.get_teacher())
+                )
+
             msg = EmailMessage(
                 'Ваш платёж прошёл успешно',
                 '''Вам открыт доступ к курсу "%s", вы можете перейти по ссылке и
diff --git a/lms/settings.py b/lms/settings.py
index 3132323..852c54d 100644
--- a/lms/settings.py
+++ b/lms/settings.py
@@ -124,7 +124,7 @@ MIDDLEWARE_CLASSES = [
 
 REST_FRAMEWORK = {
     'DEFAULT_AUTHENTICATION_CLASSES': (
-        'rest_framework.authentication.SessionAuthentication'
+        'rest_framework.authentication.SessionAuthentication',
     )
 }