diff --git a/data/default.json b/data/default.json
index e43e44c1..c413c7e0 100644
--- a/data/default.json
+++ b/data/default.json
@@ -14,7 +14,7 @@
       "_id": "5b56e70ab253020033364411"
     }
   ],
-  "lightUsers": [
+  "users": [
     {
       "id": "5b56e70ab253020033364416",
       "name": "juan carlos",
diff --git a/src/components/modes/teacher/Response.js b/src/components/modes/teacher/Response.js
index bad33244..6439ecc8 100644
--- a/src/components/modes/teacher/Response.js
+++ b/src/components/modes/teacher/Response.js
@@ -16,6 +16,7 @@ import {
 } from '../../../actions';
 import { FEEDBACK } from '../../../config/appInstanceResourceTypes';
 import FormDialog from '../../common/FormDialog';
+import { showErrorToast } from '../../../utils/toasts';
 
 class Response extends Component {
   state = {
@@ -77,11 +78,20 @@ class Response extends Component {
       dispatchPostAppInstanceResource,
       dispatchPatchAppInstanceResource,
     } = this.props;
+
+    const { id } = student;
+
+    if (!id) {
+      showErrorToast(
+        'Currently we do not support giving feedback to anonymous users.'
+      );
+    }
+
     // if no feedback resource yet, create it, otherwise, update it
     if (_.isEmpty(feedbackResource)) {
       dispatchPostAppInstanceResource({
         data: feedback,
-        userId: student.id,
+        userId: id,
         type: FEEDBACK,
       });
     } else {
diff --git a/src/components/modes/teacher/Responses.js b/src/components/modes/teacher/Responses.js
index 906305cb..a31fc7a3 100644
--- a/src/components/modes/teacher/Responses.js
+++ b/src/components/modes/teacher/Responses.js
@@ -63,9 +63,14 @@ class Responses extends Component {
       );
     }
 
+    const anonymousUser = {
+      name: t('Anonymous'),
+    };
+
     // map each app instance resource to a row in the table
     return appInstanceResources.map(({ _id, user, data }) => {
-      const studentObject = students.find(student => student.id === user) || {};
+      const studentObject =
+        students.find(student => student.id === user) || anonymousUser;
       return (
         <Response _id={_id} key={_id} student={studentObject} data={data} />
       );
diff --git a/src/config/api.js b/src/config/api.js
index bd0f04f9..47e1ca4d 100644
--- a/src/config/api.js
+++ b/src/config/api.js
@@ -7,7 +7,7 @@ export const APP_INSTANCE_RESOURCES_ENDPOINT = '/app-instance-resources';
 export const SPACES_ENDPOINT = '/spaces';
 // users endpoint is currently used in conjunction with spaces endpoint
 // e.g. `${SPACES_ENDPOINT}/${spaceId}/${USERS_ENDPOINT}`
-export const USERS_ENDPOINT = 'light-users';
+export const USERS_ENDPOINT = 'users';
 
 // request defaults
 const DEFAULT_REQUEST = {