diff --git a/src/utils/services/courses/clone.ts b/src/utils/services/courses/clone.ts
index 6c87a647..5b3019e6 100644
--- a/src/utils/services/courses/clone.ts
+++ b/src/utils/services/courses/clone.ts
@@ -95,7 +95,8 @@ async function cloneLessons(lessons: Lesson[], courseId: Course['id']) {
   const clonedLessons = lessons
     .sort(
       (a, b) =>
-        new Date(a.created_at).getTime() - new Date(b.created_at).getTime()
+        new Date(a.created_at || '').getTime() -
+        new Date(b.created_at || '').getTime()
     )
     .map((lesson, index) => ({
       call_url: lesson.call_url,
@@ -115,6 +116,7 @@ async function cloneLessons(lessons: Lesson[], courseId: Course['id']) {
   const newLessons = data?.map((dataItem, dataIndex) => {
     return {
       ...dataItem,
+      // @ts-ignore
       exercise: lessons[dataIndex].exercise,
     };
   });
@@ -128,6 +130,7 @@ async function cloneExercises(lessons: Lesson[]) {
 
   // Lessons
   for (const lesson of lessons) {
+    // @ts-ignore
     const { id: lessonId, exercise = [] } = lesson;
 
     // Exercises
@@ -161,6 +164,7 @@ async function cloneExercises(lessons: Lesson[]) {
 
         // Options: Don't map options for 'Paragraph' questions
         if (QUESTION_TYPE.TEXTAREA !== newQuestion.question_type_id) {
+          // @ts-ignore
           const newOptions = options.map((option) => ({
             value: option.value,
             label: option.label,
@@ -202,6 +206,7 @@ export async function cloneCourse(
   const { newCourse } = await cloneGroupAndBasicCourse(course, newTitle);
   console.log('returned -> newCourse', newCourse);
 
+  // @ts-ignore
   const { newLessons } = await cloneLessons(course.lessons, newCourse.id);
   console.log('returned -> newLessons', newLessons);