diff --git a/src/applications/transactions/controller/PhabricatorEditEngineController.php b/src/applications/transactions/controller/PhabricatorEditEngineController.php
--- a/src/applications/transactions/controller/PhabricatorEditEngineController.php
+++ b/src/applications/transactions/controller/PhabricatorEditEngineController.php
@@ -70,6 +70,8 @@
       ->executeOne();
     if ($config) {
       $engine = $config->getEngine();
+    } else {
+      return null;
     }
 
     if (!$engine->isEngineConfigurable()) {