diff --git a/lms/djangoapps/mobile_api/course_info/utils.py b/lms/djangoapps/mobile_api/course_info/utils.py
index b86361223275..141c32da4cf4 100644
--- a/lms/djangoapps/mobile_api/course_info/utils.py
+++ b/lms/djangoapps/mobile_api/course_info/utils.py
@@ -2,28 +2,42 @@
 Common utils for the `course_info` API.
 """
 
+import logging
+from typing import List, Optional, Union
+
 from django.core.cache import cache
 
 from lms.djangoapps.courseware.access import has_access
 from lms.djangoapps.grades.api import CourseGradeFactory
 from openedx.core.djangoapps.content.block_structure.api import get_block_structure_manager
 
+log = logging.getLogger(__name__)
+
 
-def calculate_progress(user, course_id, cache_timeout):
+def calculate_progress(
+    user: 'User',  # noqa: F821
+    course_id: 'CourseLocator',  # noqa: F821
+    cache_timeout: int,
+) -> Optional[List[Union['ReadSubsectionGrade', 'ZeroSubsectionGrade']]]:  # noqa: F821
     """
     Calculate the progress of the user in the course.
     """
     is_staff = bool(has_access(user, 'staff', course_id))
 
-    cache_key = f'course_block_structure_{str(course_id)}_{user.id}'
-    collected_block_structure = cache.get(cache_key)
-    if not collected_block_structure:
-        collected_block_structure = get_block_structure_manager(course_id).get_collected()
-        cache.set(cache_key, collected_block_structure, cache_timeout)
+    try:
+        cache_key = f'course_block_structure_{str(course_id)}_{user.id}'
+        collected_block_structure = cache.get(cache_key)
+        if not collected_block_structure:
+            collected_block_structure = get_block_structure_manager(course_id).get_collected()
+            cache.set(cache_key, collected_block_structure, cache_timeout)
+
+        course_grade = CourseGradeFactory().read(user, collected_block_structure=collected_block_structure)
 
-    course_grade = CourseGradeFactory().read(user, collected_block_structure=collected_block_structure)
+        # recalculate course grade from visible grades (stored grade was calculated over all grades, visible or not)
+        course_grade.update(visible_grades_only=True, has_staff_access=is_staff)
+        subsection_grades = list(course_grade.subsection_grades.values())
+    except Exception as err:  # pylint: disable=broad-except
+        log.warning(f'Could not get grades for the course: {course_id}, error: {err}')
+        return []
 
-    # recalculate course grade from visible grades (stored grade was calculated over all grades, visible or not)
-    course_grade.update(visible_grades_only=True, has_staff_access=is_staff)
-    subsection_grades = list(course_grade.subsection_grades.values())
     return subsection_grades
diff --git a/lms/djangoapps/mobile_api/course_info/views.py b/lms/djangoapps/mobile_api/course_info/views.py
index 352efca9b4aa..c6de108727d8 100644
--- a/lms/djangoapps/mobile_api/course_info/views.py
+++ b/lms/djangoapps/mobile_api/course_info/views.py
@@ -405,20 +405,12 @@ def _extend_sequential_info_with_assignment_progress(
             if block_info['type'] == 'sequential':
                 grade = grades_with_locations.get(block_id)
                 if grade:
-                    points_earned = (
-                        grade.graded_total.earned
-                        if grades_with_locations[block_id].graded
-                        else 0
-                    )
-                    points_possible = (
-                        grade.graded_total.possible
-                        if grades_with_locations[block_id].graded
-                        else 0
-                    )
+                    graded_total = grade.graded_total if grade.graded else None
+                    points_earned = graded_total.earned if graded_total else 0
+                    points_possible = graded_total.possible if graded_total else 0
                     assignment_type = grade.format
                 else:
-                    points_earned, points_possible = 0, 0
-                    assignment_type = None
+                    points_earned, points_possible, assignment_type = 0, 0, None
 
                 block_info.update(
                     {