diff --git a/cms/djangoapps/contentstore/views/certificates.py b/cms/djangoapps/contentstore/views/certificates.py
index b6bbe3ebe8..614a690bb2 100644
--- a/cms/djangoapps/contentstore/views/certificates.py
+++ b/cms/djangoapps/contentstore/views/certificates.py
@@ -359,11 +359,14 @@ def certificates_list_handler(request, course_key_string):
                     course_id=course.id, include_expired=True
                 ) if mode.slug != 'audit'
             ]
-            certificate_web_view_url = get_lms_link_for_certificate_web_view(
-                user_id=request.user.id,
-                course_key=course_key,
-                mode=course_modes[0]  # CourseMode.modes_for_course returns default mode if doesn't find anyone.
-            )
+            if len(course_modes) > 0:
+                certificate_web_view_url = get_lms_link_for_certificate_web_view(
+                    user_id=request.user.id,
+                    course_key=course_key,
+                    mode=course_modes[0]  # CourseMode.modes_for_course returns default mode if doesn't find anyone.
+                )
+            else:
+                certificate_web_view_url = None
             certificates = None
             is_active = False
             if settings.FEATURES.get('CERTIFICATES_HTML_VIEW', False):
diff --git a/lms/djangoapps/mobile_api/users/tests.py b/lms/djangoapps/mobile_api/users/tests.py
index ae188ff729..37e8ec6ace 100644
--- a/lms/djangoapps/mobile_api/users/tests.py
+++ b/lms/djangoapps/mobile_api/users/tests.py
@@ -20,6 +20,7 @@ from courseware.access_response import (
     StartDateError,
     VisibilityError,
 )
+from course_modes.models import CourseMode
 from student.models import CourseEnrollment
 from util.milestones_helpers import (
     set_prerequisite_courses,
@@ -94,7 +95,7 @@ class TestUserEnrollmentApi(UrlResetMixin, MobileAPITestCase, MobileAuthUserTest
         self.assertIn('course_info/{}/handouts'.format(self.course.id), found_course['course_handouts'])
         self.assertIn('video_outlines/courses/{}'.format(self.course.id), found_course['video_outline'])
         self.assertEqual(found_course['id'], unicode(self.course.id))
-        self.assertEqual(courses[0]['mode'], 'honor')
+        self.assertEqual(courses[0]['mode'], CourseMode.DEFAULT_MODE_SLUG)
         self.assertEqual(courses[0]['course']['subscription_id'], self.course.clean_id(padding_char='_'))
 
     def verify_failure(self, response, error_type=None):