diff --git a/modules/monitoring/application/views/scripts/acknowledgement/index.phtml b/modules/monitoring/application/views/scripts/acknowledgement/index.phtml
index 42ccc262e..728b83f5b 100644
--- a/modules/monitoring/application/views/scripts/acknowledgement/index.phtml
+++ b/modules/monitoring/application/views/scripts/acknowledgement/index.phtml
@@ -98,7 +98,7 @@ use Icinga\Module\Monitoring\Object\Host;
     </tbody>
   </table>
 
-  <?php if (! $acknowledgements): ?>
+  <?php if (! count($acknowledgements)): ?>
     <?= $this->translate('No comments found matching the filter'); ?>
    <?php endif ?>
 </div>