1 files changed, 8 insertions, 2 deletions
diff --git a/application/forms/Command/Object/ScheduleHostDowntimeForm.php b/application/forms/Command/Object/ScheduleHostDowntimeForm.php
index bc21114..a09b00d 100644
--- a/application/forms/Command/Object/ScheduleHostDowntimeForm.php
+++ b/application/forms/Command/Object/ScheduleHostDowntimeForm.php
@@ -4,13 +4,16 @@
 
 namespace Icinga\Module\Icingadb\Forms\Command\Object;
 
+use CallbackFilterIterator;
 use DateInterval;
 use DateTime;
 use Icinga\Application\Config;
 use Icinga\Module\Icingadb\Command\Object\PropagateHostDowntimeCommand;
 use Icinga\Module\Icingadb\Command\Object\ScheduleHostDowntimeCommand;
 use Icinga\Web\Notification;
+use ipl\Orm\Model;
 use ipl\Web\FormDecorator\IcingaFormDecorator;
+use Iterator;
 use Traversable;
 
 class ScheduleHostDowntimeForm extends ScheduleServiceDowntimeForm
@@ -87,10 +90,13 @@ class ScheduleHostDowntimeForm extends ScheduleServiceDowntimeForm
         $decorator->decorate($this->getElement('child_options'));
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
-        $granted = $this->filterGrantedOn('icingadb/command/downtime/schedule', $objects);
+        $granted = new CallbackFilterIterator($objects, function (Model $object): bool {
+            return $this->isGrantedOn('icingadb/command/downtime/schedule', $object);
+        });
 
+        $granted->rewind(); // Forwards the pointer to the first element
         if ($granted->valid()) {
             if (($childOptions = (int) $this->getValue('child_options'))) {
                 $command = new PropagateHostDowntimeCommand();