diff --git a/tryton/gui/main.py b/tryton/gui/main.py
index 6fe3af84d0..48e29cce5d 100644
--- a/tryton/gui/main.py
+++ b/tryton/gui/main.py
@@ -967,7 +967,7 @@ class Main(object):
         self.menu_screen = None
         self.menu_expander_clear()
         action = PYSONDecoder().decode(prefs['pyson_menu'])
-        view_ids = False
+        view_ids = []
         if action.get('views', []):
             view_ids = [x[0] for x in action['views']]
         elif action.get('view_id', False):
diff --git a/tryton/gui/window/view_board/action.py b/tryton/gui/window/view_board/action.py
index fdc0b2bdc2..2c8230f946 100644
--- a/tryton/gui/window/view_board/action.py
+++ b/tryton/gui/window/view_board/action.py
@@ -29,7 +29,7 @@ class Action(SignalEvent):
         except RPCException:
             raise
 
-        view_ids = None
+        view_ids = []
         self.action['view_mode'] = None
         if self.action.get('views', []):
             view_ids = [x[0] for x in self.action['views']]
diff --git a/tryton/gui/window/win_search.py b/tryton/gui/window/win_search.py
index 3aaf01a853..5acf72cb4e 100644
--- a/tryton/gui/window/win_search.py
+++ b/tryton/gui/window/win_search.py
@@ -17,6 +17,8 @@ class WinSearch(NoModal):
             domain=None, view_ids=None, views_preload=None, new=True,
             title=''):
         NoModal.__init__(self)
+        if view_ids is None:
+            view_ids = []
         if views_preload is None:
             views_preload = {}
         self.domain = domain or []