diff --git a/openerp/addons/base/ir/ir_model.py b/openerp/addons/base/ir/ir_model.py
index 74589003611..633db6de6a3 100644
--- a/openerp/addons/base/ir/ir_model.py
+++ b/openerp/addons/base/ir/ir_model.py
@@ -557,7 +557,9 @@ class ir_model_access(osv.osv):
             model_name = model
 
         # TransientModel records have no access rights, only an implicit access rule
-        if self.pool.get(model_name).is_transient():
+        if not self.pool.get(model_name):
+            _logger.error('Missing model %s' % (model_name, ))
+        elif self.pool.get(model_name).is_transient():
             return True
 
         # We check if a specific rule exists
diff --git a/openerp/addons/base/ir/ir_ui_menu.py b/openerp/addons/base/ir/ir_ui_menu.py
index 4bbff5479c3..213cff18cc6 100644
--- a/openerp/addons/base/ir/ir_ui_menu.py
+++ b/openerp/addons/base/ir/ir_ui_menu.py
@@ -265,7 +265,7 @@ class ir_ui_menu(osv.osv):
             }
             if menu.action and menu.action.type in ('ir.actions.act_window','ir.actions.client') and menu.action.res_model:
                 obj = self.pool.get(menu.action.res_model)
-                if obj._needaction:
+                if obj and obj._needaction:
                     if menu.action.type=='ir.actions.act_window':
                         dom = menu.action.domain and eval(menu.action.domain, {'uid': uid}) or []
                     else: