From a68c8ae6d21185fc13825739900ce9d11a636ddf Mon Sep 17 00:00:00 2001
From: Igor Scheller <igor.scheller@igorshp.de>
Date: Fri, 8 Oct 2021 15:38:58 +0200
Subject: [PATCH] Fixes #824: Server error when no shifts configured and with
 'user_shifts' as home site

---
 includes/pages/user_shifts.php | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/includes/pages/user_shifts.php b/includes/pages/user_shifts.php
index 3fde65e2..debb9b41 100644
--- a/includes/pages/user_shifts.php
+++ b/includes/pages/user_shifts.php
@@ -49,7 +49,10 @@ function update_ShiftsFilter_timerange(ShiftsFilter $shiftsFilter, $days)
 {
     $start_time = $shiftsFilter->getStartTime();
     if (is_null($start_time)) {
-        $first_day = DateTime::createFromFormat('Y-m-d', $days[0])->getTimestamp();
+        $first_day = DateTime::createFromFormat(
+            'Y-m-d',
+            $days[0] ?? (new DateTime())->format('Y-m-d')
+        )->getTimestamp();
         if(time() < $first_day) {
             $start_time = $first_day;
         } else {