diff --git a/lms/djangoapps/instructor/views/api.py b/lms/djangoapps/instructor/views/api.py
index 9ad1c2d..c9b5789 100644
--- a/lms/djangoapps/instructor/views/api.py
+++ b/lms/djangoapps/instructor/views/api.py
@@ -1504,7 +1504,7 @@ def spoc_gradebook(request, course_id):
             'grade_summary': student_grades(student, request, course),
             'realname': student.profile.name,
         }
-        for student in enrolled_students if student != None
+        for student in enrolled_students if student.profile != None
     ]
 
     return render_to_response('courseware/gradebook.html', {