diff --git a/src/applications/base/controller/PhabricatorController.php b/src/applications/base/controller/PhabricatorController.php
index 58d8f6cf6f..c4d1b47c40 100644
--- a/src/applications/base/controller/PhabricatorController.php
+++ b/src/applications/base/controller/PhabricatorController.php
@@ -471,7 +471,7 @@ abstract class PhabricatorController extends AphrontController {
       ->setViewer($this->getViewer());
   }
 
-  public function newCurtainView($object) {
+  public function newCurtainView($object = null) {
     $viewer = $this->getViewer();
 
     $action_id = celerity_generate_unique_node_id();
@@ -491,9 +491,11 @@ abstract class PhabricatorController extends AphrontController {
       ->setViewer($viewer)
       ->setActionList($action_list);
 
-    $panels = PHUICurtainExtension::buildExtensionPanels($viewer, $object);
-    foreach ($panels as $panel) {
-      $curtain->addPanel($panel);
+    if ($object) {
+      $panels = PHUICurtainExtension::buildExtensionPanels($viewer, $object);
+      foreach ($panels as $panel) {
+        $curtain->addPanel($panel);
+      }
     }
 
     return $curtain;
diff --git a/src/applications/project/controller/PhabricatorProjectMembersViewController.php b/src/applications/project/controller/PhabricatorProjectMembersViewController.php
index 30ff425a51..ad553eb664 100644
--- a/src/applications/project/controller/PhabricatorProjectMembersViewController.php
+++ b/src/applications/project/controller/PhabricatorProjectMembersViewController.php
@@ -70,7 +70,7 @@ final class PhabricatorProjectMembersViewController
     $viewer = $this->getViewer();
     $id = $project->getID();
 
-    $curtain = $this->newCurtainView($project);
+    $curtain = $this->newCurtainView();
 
     $is_locked = $project->getIsMembershipLocked();
 
diff --git a/src/applications/project/controller/PhabricatorProjectSubprojectsController.php b/src/applications/project/controller/PhabricatorProjectSubprojectsController.php
index 4a89bb4cde..1aa0c0baac 100644
--- a/src/applications/project/controller/PhabricatorProjectSubprojectsController.php
+++ b/src/applications/project/controller/PhabricatorProjectSubprojectsController.php
@@ -203,7 +203,7 @@ final class PhabricatorProjectSubprojectsController
     $allows_milestones = $project->supportsMilestones();
     $allows_subprojects = $project->supportsSubprojects();
 
-    $curtain = $this->newCurtainView($project);
+    $curtain = $this->newCurtainView();
 
     if ($allows_milestones && $milestones) {
       $milestone_text = pht('Create Next Milestone');