diff --git a/rhodecode/apps/_base/__init__.py b/rhodecode/apps/_base/__init__.py
--- a/rhodecode/apps/_base/__init__.py
+++ b/rhodecode/apps/_base/__init__.py
@@ -26,6 +26,7 @@ from pyramid import compat
 from pyramid.httpexceptions import HTTPFound, HTTPForbidden, HTTPBadRequest
 
 from rhodecode.lib import helpers as h, diffs, rc_cache
+from rhodecode.lib.utils import repo_name_slug
 from rhodecode.lib.utils2 import (
     StrictAttributeDict, str2bool, safe_int, datetime_to_time, safe_unicode)
 from rhodecode.lib.markup_renderer import MarkupRenderer, relative_links
@@ -617,6 +618,10 @@ class RepoRoutePredicate(object):
             return
 
         repo_name = info['match']['repo_name']
+        if repo_name != repo_name_slug(repo_name):
+            # short-skip if the repo-name doesn't follow slug rule
+            return False
+
         repo_model = repo.RepoModel()
 
         by_name_match = repo_model.get_by_repo_name(repo_name, cache=False)
@@ -722,6 +727,9 @@ class RepoGroupRoutePredicate(object):
             return
 
         repo_group_name = info['match']['repo_group_name']
+        if repo_group_name != repo_name_slug(repo_group_name):
+            return False
+
         repo_group_model = repo_group.RepoGroupModel()
         by_name_match = repo_group_model.get_by_group_name(repo_group_name, cache=False)