diff --git a/kallithea/templates/admin/repos/repo_edit_permissions.html b/kallithea/templates/admin/repos/repo_edit_permissions.html
--- a/kallithea/templates/admin/repos/repo_edit_permissions.html
+++ b/kallithea/templates/admin/repos/repo_edit_permissions.html
@@ -12,7 +12,7 @@ ${h.form(url('edit_repo_perms_update', r
                     <td></td>
                 </tr>
                 ## USERS
-                %for r2p in sorted(c.repo_info.repo_to_perm, key=lambda x: x.user.username != 'default' and x.user.username):
+                %for r2p in sorted(c.repo_info.repo_to_perm, key=lambda x: '' if x.user.username == 'default' else x.user.username):
                     %if r2p.user.username =='default' and c.repo_info.private:
                         <tr>
                             <td colspan="4">