diff --git a/kallithea/lib/base.py b/kallithea/lib/base.py
--- a/kallithea/lib/base.py
+++ b/kallithea/lib/base.py
@@ -201,7 +201,7 @@ class BaseVCSController(object):
             from kallithea.lib.utils import get_repo_by_id
             by_id_match = get_repo_by_id(repo_name)
             if by_id_match:
-                data[1] = by_id_match
+                data[1] = safe_str(by_id_match)
 
         return '/'.join(data)
 
diff --git a/kallithea/lib/middleware/simplehg.py b/kallithea/lib/middleware/simplehg.py
--- a/kallithea/lib/middleware/simplehg.py
+++ b/kallithea/lib/middleware/simplehg.py
@@ -84,7 +84,7 @@ class SimpleHg(BaseVCSController):
         #======================================================================
         try:
             str_repo_name = environ['REPO_NAME'] = self.__get_repository(environ)
-            assert isinstance(str_repo_name, str)
+            assert isinstance(str_repo_name, str), str_repo_name
             repo_name = safe_unicode(str_repo_name)
             assert safe_str(repo_name) == str_repo_name, (str_repo_name, repo_name)
             log.debug('Extracted repo name is %s', repo_name)
diff --git a/kallithea/tests/functional/test_admin_repos.py b/kallithea/tests/functional/test_admin_repos.py
--- a/kallithea/tests/functional/test_admin_repos.py
+++ b/kallithea/tests/functional/test_admin_repos.py
@@ -4,6 +4,8 @@ import os
 import mock
 import urllib
 
+import pytest
+
 from kallithea.lib import vcs
 from kallithea.model.db import Repository, RepoGroup, UserRepoToPerm, User,\
     Permission
@@ -654,3 +656,8 @@ class TestAdminReposControllerHG(TestCon
     NEW_REPO = NEW_HG_REPO
     OTHER_TYPE_REPO = GIT_REPO
     OTHER_TYPE = 'git'
+
+    def test_permanent_url_protocol_access(self):
+        with pytest.raises(Exception) as e:
+            self.app.get(url('summary_home', repo_name='_1'), extra_environ={'HTTP_ACCEPT': 'application/mercurial'})
+        assert 'Unable to detect pull/push action' in str(e)