diff -r 0e8c775ca958 -r 5139e1da058e src/pyams_content/features/menu/portlet/navigation/double.py
--- a/src/pyams_content/features/menu/portlet/navigation/double.py	Tue Jul 17 18:01:54 2018 +0200
+++ b/src/pyams_content/features/menu/portlet/navigation/double.py	Tue Jul 17 18:08:54 2018 +0200
@@ -46,7 +46,6 @@
     """Double navigation portlet settings"""
 
     title = FieldProperty(IDoubleNavigationPortletSettings['title'])
-    subtitle = FieldProperty(IDoubleNavigationPortletSettings['subtitle'])
 
     @property
     def menus(self):