diff --git a/src/applications/project/phid/PhabricatorProjectProjectPHIDType.php b/src/applications/project/phid/PhabricatorProjectProjectPHIDType.php
--- a/src/applications/project/phid/PhabricatorProjectProjectPHIDType.php
+++ b/src/applications/project/phid/PhabricatorProjectProjectPHIDType.php
@@ -47,6 +47,10 @@
         $handle->setObjectName('#'.$slug);
         $handle->setURI("/tag/{$slug}/");
       } else {
+        // We set the name to the project's PHID to avoid a parse error when a
+        // project has no hashtag (as is the case with milestones by default).
+        // See T12659 for more details
+        $handle->setCommandLineObjectName($project->getPHID());
         $handle->setURI("/project/view/{$id}/");
       }