diff --git a/public/react/src/modules/courses/members/CourseGroupListTable.js b/public/react/src/modules/courses/members/CourseGroupListTable.js
index 84edb2fc5..4645cf838 100644
--- a/public/react/src/modules/courses/members/CourseGroupListTable.js
+++ b/public/react/src/modules/courses/members/CourseGroupListTable.js
@@ -198,7 +198,7 @@ function CourseGroupListTable(props) {
     const dataSource = course_groups.map(item => {
         return {
             ...item,
-            subStringOfMember_manager : item.member_manager.length > 92 
+            subStringOfMember_manager : (item.member_manager && item.member_manager.length > 92)
                 ? item.member_manager.substring(0, 92) + '...' : null
         }
     })