diff --git a/sourcing/model.py b/sourcing/model.py
index ac5bf17..d6b2820 100644
--- a/sourcing/model.py
+++ b/sourcing/model.py
@@ -240,13 +240,18 @@ span: {},start=0,length={}'''.format(self.external_url, title_source_doc.externa
     @classmethod
     def from_external(cls, url, home=None):
         base = current_app.config.get('BASE_URL')
+        username, hashid = None, None
         if home is None:
             home = url_for('view.home', _external=True)
         if url.startswith(home):
             username, _, hashid = url[len(home):].partition('/')
         elif base and url.startswith(base):
             username, _, hashid = url[len(base):].lstrip('/').partition('/')
-        else:
+
+        if username and '/' in username or hashid and '/' in hashid:
+            username, hashid = None, None
+
+        if not username or not hashid:
             m = re_server_url.match(url)
             if not m:
                 return