diff --git a/src/core/course/providers/helper.ts b/src/core/course/providers/helper.ts
index 73ac7e3a4..6bbc497a8 100644
--- a/src/core/course/providers/helper.ts
+++ b/src/core/course/providers/helper.ts
@@ -1083,7 +1083,7 @@ export class CoreCourseHelperProvider {
             }
 
             const sectionWithModules = sections.find((section) => {
-                    return section.modules.length > 0;
+                    return section.modules && section.modules.length > 0;
             });
             if (!sectionWithModules || typeof sectionWithModules.modules[0].completion == 'undefined') {
                 promises.push(this.courseProvider.getActivitiesCompletionStatus(course.id));