diff --git a/src/applications/dashboard/controller/dashboard/PhabricatorDashboardInstallController.php b/src/applications/dashboard/controller/dashboard/PhabricatorDashboardInstallController.php
index 417086b405..850e89b51b 100644
--- a/src/applications/dashboard/controller/dashboard/PhabricatorDashboardInstallController.php
+++ b/src/applications/dashboard/controller/dashboard/PhabricatorDashboardInstallController.php
@@ -32,7 +32,7 @@ final class PhabricatorDashboardInstallController
     $workflow_key = $request->getURIData('workflowKey');
 
     $workflows = PhabricatorDashboardInstallWorkflow::getAllWorkflows();
-    if (!isset($workflows[$workflow_key])) {
+    if ($workflow_key === null || !isset($workflows[$workflow_key])) {
       return $this->newWorkflowDialog($dashboard, $workflows);
     }