diff --git a/lms/lms/api.py b/lms/lms/api.py
index b6b91851..87127272 100644
--- a/lms/lms/api.py
+++ b/lms/lms/api.py
@@ -850,17 +850,18 @@ def get_announcements(batch):
 
 @frappe.whitelist()
 def delete_course(course):
-	chapters = frappe.get_all("Course Chapter", {"course": course}, pluck="name")
+	frappe.db.delete("LMS Enrollment", {"course": course})
+	frappe.db.delete("LMS Course Progress", {"course": course})
+	frappe.db.set_value("LMS Quiz", {"course": course}, "course", None)
+	frappe.db.set_value("LMS Quiz Submission", {"course": course}, "course", None)
 
-	chapter_references = frappe.get_all("Chapter Reference", {"parent": course}, pluck="name")
+	chapters = frappe.get_all("Course Chapter", {"course": course}, pluck="name")
+	frappe.db.delete("Chapter Reference", {"parent": course})
 
 	for chapter in chapters:
 		lessons = frappe.get_all("Course Lesson", {"chapter": chapter}, pluck="name")
 
-		lesson_references = frappe.get_all("Lesson Reference", {"parent": chapter}, pluck="name")
-
-		for lesson in lesson_references:
-			frappe.delete_doc("Lesson Reference", lesson)
+		frappe.db.delete("Lesson Reference", {"parent": chapter})
 
 		for lesson in lessons:
 			topics = frappe.get_all(
@@ -871,21 +872,13 @@ def delete_course(course):
 
 			for topic in topics:
 				frappe.db.delete("Discussion Reply", {"topic": topic})
-
 				frappe.db.delete("Discussion Topic", topic)
 
 			frappe.delete_doc("Course Lesson", lesson)
 
-	for chapter in chapter_references:
-		frappe.delete_doc("Chapter Reference", chapter)
-
 	for chapter in chapters:
 		frappe.delete_doc("Course Chapter", chapter)
 
-	frappe.db.delete("LMS Course Progress", {"course": course})
-	frappe.db.delete("LMS Quiz", {"course": course})
-	frappe.db.delete("LMS Quiz Submission", {"course": course})
-	frappe.db.delete("LMS Enrollment", {"course": course})
 	frappe.delete_doc("LMS Course", course)