diff --git a/library/Businessprocess/Web/Form/QuickForm.php b/library/Businessprocess/Web/Form/QuickForm.php
index 96a84cd..61af62f 100644
--- a/library/Businessprocess/Web/Form/QuickForm.php
+++ b/library/Businessprocess/Web/Form/QuickForm.php
@@ -130,9 +130,10 @@ abstract class QuickForm extends QuickBaseForm
             )
         );
 
-        $grp = array(
-            $this->submitButtonName ?? '',
-            $this->deleteButtonName ?? ''
+        // Add display group for defined buttons only
+        $grp = array_filter(
+            [$this->submitButtonName, $this->deleteButtonName],
+            fn($x) => $x !== null
         );
         $this->addDisplayGroup($grp, 'buttons', array(
             'decorators' => array(