diff --git a/src/applications/search/controller/PhabricatorSearchHovercardController.php b/src/applications/search/controller/PhabricatorSearchHovercardController.php
--- a/src/applications/search/controller/PhabricatorSearchHovercardController.php
+++ b/src/applications/search/controller/PhabricatorSearchHovercardController.php
@@ -98,7 +98,8 @@
 
     $results = array();
     foreach ($cards as $card_key => $card) {
-      $object_phid = $card['objectPHID'];
+      $object_phid =
+        array_key_exists('objectPHID', $card) ? $card['objectPHID'] : null;
 
       $handle = $handles[$object_phid];
       $object = idx($objects, $object_phid);