diff --git a/src/main/java/com/teaching/backend/service/impl/courses/CoursesServiceImpl.java b/src/main/java/com/teaching/backend/service/impl/courses/CoursesServiceImpl.java
index 313b3aa..7d5eab9 100644
--- a/src/main/java/com/teaching/backend/service/impl/courses/CoursesServiceImpl.java
+++ b/src/main/java/com/teaching/backend/service/impl/courses/CoursesServiceImpl.java
@@ -417,7 +417,9 @@ public class CoursesServiceImpl extends ServiceImpl<CoursesMapper, Courses> impl
                 List<StudentCourses> studentUsernames = studentCoursesMapper.selectBatchSomeStudent(courseId);
                 for (StudentCourses studentUsername : studentUsernames) {
                     UmsStudentManage umsStudentManage = umsStudentManageMapper.queryStudent(String.valueOf(studentUsername.getStudent()));
-                    umsStudentManageList.add(umsStudentManage);
+                    if (umsStudentManage != null){
+                        umsStudentManageList.add(umsStudentManage);
+                    }
                 }
             }
             return umsStudentManageList;