diff --git a/app/views/admins/courses/index.xlsx.axlsx b/app/views/admins/courses/index.xlsx.axlsx
index fb07e1dab..934ca845c 100644
--- a/app/views/admins/courses/index.xlsx.axlsx
+++ b/app/views/admins/courses/index.xlsx.axlsx
@@ -26,7 +26,7 @@ wb.styles do |s|
         course.student_works_count,
         course.exercises_count,
         course.evaluate_count,
-        course.topic_count,
+        topic_count,
         course.is_public == 1 ? "--" : "√",
         course.is_end ? "已结束" : "正在进行",
         course.school&.name,