From bde8ce214f302991cd644e6b4d6c9bc786d91264 Mon Sep 17 00:00:00 2001
From: Andrea <andrea@avris.it>
Date: Sat, 15 Jan 2022 17:01:36 +0100
Subject: [PATCH] [calendar] fix .ics

---
 src/calendar/helpers.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/calendar/helpers.js b/src/calendar/helpers.js
index 880229e8..d313ef37 100644
--- a/src/calendar/helpers.js
+++ b/src/calendar/helpers.js
@@ -78,6 +78,12 @@ module.exports.Event = class {
 
     getDays(year) {
         year = parseInt(year);
+
+        if (this.daysMemoise === undefined) {
+            // shouldn't happen, but somehow does, but only on prod?
+            this.daysMemoise = {};
+        }
+
         if (this.daysMemoise[year] === undefined) {
             this.daysMemoise[year] = [...this.generator(iterateMonth(year, this.month))];
         }
@@ -111,6 +117,9 @@ module.exports.Event = class {
 
     toIcs(year, translations, clearLinkedText, sequence = 1) {
         const days = this.getDays(year);
+        if (!days.length) {
+            return null;
+        }
         const first = days[0];
         const last = days[days.length - 1].next();