diff --git a/app/src/mailbox-perspective.es6 b/app/src/mailbox-perspective.es6
index b62561599..9859db886 100644
--- a/app/src/mailbox-perspective.es6
+++ b/app/src/mailbox-perspective.es6
@@ -408,7 +408,10 @@ class CategoryMailboxPerspective extends MailboxPerspective {
     return this._categories.some(cat => {
       const representedFolder =
         cat instanceof Folder ? cat : CategoryStore.getAllMailCategory(cat.accountId);
-      return FolderSyncProgressStore.isSyncingAccount(cat.accountId, representedFolder.path);
+      return (
+        representedFolder &&
+        FolderSyncProgressStore.isSyncingAccount(cat.accountId, representedFolder.path)
+      );
     });
   }