diff --git a/lib/ui/pages/coursedetail/screen/course_info_page.dart b/lib/ui/pages/coursedetail/screen/course_info_page.dart
index cd6824a5..b3efe1d1 100644
--- a/lib/ui/pages/coursedetail/screen/course_info_page.dart
+++ b/lib/ui/pages/coursedetail/screen/course_info_page.dart
@@ -202,6 +202,7 @@ class _CourseInfoPageState extends State<CourseInfoPage> with AutomaticKeepAlive
 
   Future<List<CourseStudent>> _getCourseStudent() async {
     TaskFlow taskFlow = TaskFlow();
+    final courseMainInfo = widget.courseInfo.main;
     final task = IPlusGetStudentListTask(courseId: courseMainInfo.course.id);
     taskFlow.addTask(task);
     if (await taskFlow.start()) {
@@ -229,6 +230,7 @@ class _CourseInfoPageState extends State<CourseInfoPage> with AutomaticKeepAlive
 
   void _loadCourseStudent() async {
     TaskFlow taskFlow = TaskFlow();
+    final courseMainInfo = widget.courseInfo.main;
     final task = IPlusGetStudentListTask(courseId: courseMainInfo.course.id);
     taskFlow.addTask(task);
     if (await taskFlow.start()) {