diff --git a/application/forms/CleanupNodeForm.php b/application/forms/CleanupNodeForm.php
index 5387e15..b4a7ad3 100644
--- a/application/forms/CleanupNodeForm.php
+++ b/application/forms/CleanupNodeForm.php
@@ -45,10 +45,12 @@ class CleanupNodeForm extends BpConfigBaseForm
     {
         $changes = ProcessChanges::construct($this->bp, $this->session);
 
+        /** @var string[] $nodesToCleanup */
         $nodesToCleanup = $this->getValue('cleanup_all') === '1'
             ? array_keys($this->bp->getMissingChildren())
             : $this->getValue('nodes');
 
+        $nodeName = null;
         foreach ($nodesToCleanup as $nodeName) {
             $node = $this->bp->getNode($nodeName);
             $changes->deleteNode($node);