--- a/hooks/security.py	Tue Jul 21 18:09:12 2015 +0200
+++ b/hooks/security.py	Tue Jul 21 18:17:31 2015 +0200
@@ -146,7 +146,10 @@
         entity = cnx.entity_cache(eid)
     except KeyError:
         return False
-    return rschema.type in entity.cw_edited.skip_security
+    edited = getattr(entity, 'cw_edited', None)
+    if edited is None:
+        return False
+    return rschema.type in edited.skip_security
 
 
 class BeforeAddRelationSecurityHook(SecurityHook):