diff --git a/src/views/activity.js b/src/views/activity.js
index 23c7abd64..19ea63000 100644
--- a/src/views/activity.js
+++ b/src/views/activity.js
@@ -300,7 +300,7 @@ angular.module('Application').controller('ActivityController', ['$scope', '$loca
             return 'Backup cleaner started';
 
         case ACTION_BACKUP_CLEANUP_FINISH:
-            return data.errorMessage ? 'Backup cleaner errored: ' + data.errorMessage : 'Backup cleaner removed ' + data.removedBoxBackups.length + ' backups';
+            return data.errorMessage ? 'Backup cleaner errored: ' + data.errorMessage : 'Backup cleaner removed ' + (data.removedBoxBackups ? data.removedBoxBackups.length : '0') + ' backups';
 
         case ACTION_CERTIFICATE_NEW:
             return 'Certificate install for ' + data.domain + (errorMessage ? ' failed' : ' succeeded');