diff --git a/src/applications/phid/handle/data/PhabricatorObjectHandleData.php b/src/applications/phid/handle/data/PhabricatorObjectHandleData.php
index 06b99cccb3..f4fb0059d2 100644
--- a/src/applications/phid/handle/data/PhabricatorObjectHandleData.php
+++ b/src/applications/phid/handle/data/PhabricatorObjectHandleData.php
@@ -202,7 +202,8 @@ class PhabricatorObjectHandleData {
             $handle = new PhabricatorObjectHandle();
             $handle->setPHID($phid);
             $handle->setType($type);
-            if (empty($commits[$phid])) {
+            if (empty($commits[$phid]) ||
+                !isset($callsigns[$repository_ids[$phid]])) {
               $handle->setName('Unknown Commit');
             } else {
               $commit = $commits[$phid];