1 files changed, 9 insertions, 12 deletions
diff --git a/application/forms/Command/Object/DeleteDowntimeForm.php b/application/forms/Command/Object/DeleteDowntimeForm.php
index 5f695b9..b13bcc5 100644
--- a/application/forms/Command/Object/DeleteDowntimeForm.php
+++ b/application/forms/Command/Object/DeleteDowntimeForm.php
@@ -4,12 +4,14 @@
 
 namespace Icinga\Module\Icingadb\Forms\Command\Object;
 
-use Generator;
+use CallbackFilterIterator;
 use Icinga\Module\Icingadb\Command\Object\DeleteDowntimeCommand;
 use Icinga\Module\Icingadb\Forms\Command\CommandForm;
 use Icinga\Web\Notification;
+use ipl\Orm\Model;
 use ipl\Web\Common\RedirectOption;
 use ipl\Web\Widget\Icon;
+use Iterator;
 use Traversable;
 
 class DeleteDowntimeForm extends CommandForm
@@ -66,19 +68,14 @@ class DeleteDowntimeForm extends CommandForm
         );
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
-        $granted = (function () use ($objects): Generator {
-            foreach ($objects as $object) {
-                if (
-                    $this->isGrantedOn('icingadb/command/downtime/delete', $object->{$object->object_type})
-                    && $object->scheduled_by === null
-                ) {
-                    yield $object;
-                }
-            }
-        })();
+        $granted = new CallbackFilterIterator($objects, function (Model $object): bool {
+            return $object->scheduled_by === null
+                && $this->isGrantedOn('icingadb/command/downtime/delete', $object->{$object->object_type});
+        });
 
+        $granted->rewind(); // Forwards the pointer to the first element
         if ($granted->valid()) {
             $command = new DeleteDowntimeCommand();
             $command->setObjects($granted);