diff --git a/src/components/admin/CurriculumEditor.tsx b/src/components/admin/CurriculumEditor.tsx
index cbcf585..a114242 100644
--- a/src/components/admin/CurriculumEditor.tsx
+++ b/src/components/admin/CurriculumEditor.tsx
@@ -212,7 +212,7 @@ export function CurriculumEditor({ productId }: CurriculumEditorProps) {
       mp4_url: lesson.mp4_url || '',
       video_host: lesson.video_host || 'youtube',
       release_at: lesson.release_at ? lesson.release_at.split('T')[0] : '',
-      chapters: lesson.chapters || [],
+      chapters: lesson.chapters ? [...lesson.chapters] : [], // Create a copy to avoid mutation
     });
     setLessonDialogOpen(true);
   };