diff --git a/web/src/js/modules/api.js b/web/src/js/modules/api.js
index 0dbff28e..3921fb67 100644
--- a/web/src/js/modules/api.js
+++ b/web/src/js/modules/api.js
@@ -238,8 +238,8 @@ export const api = {
             id: courseJSON.id,
             title: courseJSON.title,
             short_description: courseJSON.short_description,
-            category: courseJSON.category.id ? courseJSON.category.id : courseJSON.category,
-            author: courseJSON.author.id ? courseJSON.author.id : courseJSON.author,
+            category: courseJSON.category && courseJSON.category.id ? courseJSON.category.id : courseJSON.category,
+            author: courseJSON.author && courseJSON.author.id ? courseJSON.author.id : courseJSON.author,
             price: parseFloat(courseJSON.price),
             is_paid: parseFloat(courseJSON.price) > 0,
             is_deferred: isDeferred,