diff --git a/finance/signals.py b/finance/signals.py
index e5dea98..7f104c1 100644
--- a/finance/signals.py
+++ b/finance/signals.py
@@ -43,7 +43,7 @@ def invoice_signal(instance, **kwargs):
                 )
                 ProgressLesson.objects.create(
                     progress=p,
-                    lesson_token=course.get_first_lesson(),
+                    lesson_token=course.get_first_lesson().token,
                     checker=p.user,
                 )