diff --git a/modules/worker/front/calendar/index.js b/modules/worker/front/calendar/index.js
index dafa1d24d..bfb313630 100644
--- a/modules/worker/front/calendar/index.js
+++ b/modules/worker/front/calendar/index.js
@@ -40,10 +40,14 @@ class Controller {
         const holidays = data.holidays;
         const events = [];
         holidays.forEach(holiday => {
+            const holidayDetail = holiday.detail && holiday.detail.description;
+            const holidayType = holiday.type && holiday.type.name;
+            const holidayName = holidayDetail || holidayType;
+
             events.push({
                 dated: holiday.dated,
                 className: 'red',
-                title: holiday.detail.description || holiday.type.name,
+                title: holidayName,
                 isRemovable: false
             });
         });