diff --git a/addons/hr_holidays/models/hr_holidays.py b/addons/hr_holidays/models/hr_holidays.py
index 003d4ed26f9..64390ec90f1 100644
--- a/addons/hr_holidays/models/hr_holidays.py
+++ b/addons/hr_holidays/models/hr_holidays.py
@@ -248,7 +248,7 @@ class Holidays(models.Model):
             if nholidays:
                 raise ValidationError(_('You can not have 2 leaves that overlaps on same day!'))
 
-    @api.constrains('state', 'number_of_days_temp')
+    @api.constrains('state', 'number_of_days_temp', 'holiday_status_id')
     def _check_holidays(self):
         for holiday in self:
             if holiday.holiday_type != 'employee' or holiday.type != 'remove' or not holiday.employee_id or holiday.holiday_status_id.limit:
diff --git a/addons/mrp/models/mrp_production.py b/addons/mrp/models/mrp_production.py
index d8480672593..c7d41c90057 100644
--- a/addons/mrp/models/mrp_production.py
+++ b/addons/mrp/models/mrp_production.py
@@ -349,7 +349,7 @@ class MrpProduction(models.Model):
             source_location = routing.location_id
         else:
             source_location = self.location_src_id
-        original_quantity = self.product_qty - self.qty_produced
+        original_quantity = (self.product_qty - self.qty_produced) or 1.0
         data = {
             'sequence': bom_line.sequence,
             'name': self.name,
diff --git a/addons/website_sale/controllers/main.py b/addons/website_sale/controllers/main.py
index d80fc13b61d..990ad81d476 100644
--- a/addons/website_sale/controllers/main.py
+++ b/addons/website_sale/controllers/main.py
@@ -2,7 +2,7 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 import json
 import logging
-from werkzeug.exceptions import Forbidden
+from werkzeug.exceptions import Forbidden, NotFound
 
 from odoo import http, tools, _
 from odoo.http import request
@@ -193,6 +193,11 @@ class WebsiteSale(http.Controller):
         else:
             ppg = PPG
 
+        if category:
+            category = request.env['product.public.category'].search([('id', '=', int(category))], limit=1)
+            if not category:
+                raise NotFound()
+
         attrib_list = request.httprequest.args.getlist('attrib')
         attrib_values = [map(int, v.split("-")) for v in attrib_list if v]
         attributes_ids = set([v[0] for v in attrib_values])
@@ -213,9 +218,6 @@ class WebsiteSale(http.Controller):
         url = "/shop"
         if search:
             post["search"] = search
-        if category:
-            category = request.env['product.public.category'].browse(int(category))
-            url = "/shop/category/%s" % slug(category)
         if attrib_list:
             post['attrib'] = attrib_list
 
@@ -224,6 +226,7 @@ class WebsiteSale(http.Controller):
 
         parent_category_ids = []
         if category:
+            url = "/shop/category/%s" % slug(category)
             parent_category_ids = [category.id]
             current_category = category
             while current_category.parent_id: