prevent php8 warning, fixes #6237

Closes #6237

Merge request studip/studip!4717

1 files changed, 6 insertions, 3 deletions

diff --git a/lib/models/resources/ResourceRequest.php b/lib/models/resources/ResourceRequest.php
index 12a1e41..0fe0342 100644
--- a/lib/models/resources/ResourceRequest.php
+++ b/lib/models/resources/ResourceRequest.php
@@ -863,7 +863,10 @@ class ResourceRequest extends SimpleORMap implements PrivacyObject, Studip\Calen
     public function getEndDate()
     {
         $end_date = new DateTime();
-        if (count($this->appointments) > 0) {
+        if (
+            count($this->appointments) > 0
+            && isset($this->appointments->last()->appointment->end_time)
+        ) {
             $end_date->setTimestamp($this->appointments->last()->appointment->end_time);
             return $end_date;
         }
@@ -879,7 +882,7 @@ class ResourceRequest extends SimpleORMap implements PrivacyObject, Studip\Calen
                 return null;
             }
 
-            $end_date->setTimestamp($this->cycle->dates->last()->end_time);
+            $end_date->setTimestamp($date->end_time);
             return $end_date;
         }
 
@@ -889,7 +892,7 @@ class ResourceRequest extends SimpleORMap implements PrivacyObject, Studip\Calen
                 return null;
             }
 
-            $end_date->setTimestamp($this->course->dates->last()->end_time);
+            $end_date->setTimestamp($date->end_time);
             return $end_date;
         }