diff --git a/addons/im_livechat/im_livechat.py b/addons/im_livechat/im_livechat.py
index d4affe4b971..558668de10d 100644
--- a/addons/im_livechat/im_livechat.py
+++ b/addons/im_livechat/im_livechat.py
@@ -25,7 +25,7 @@ import random
 import re
 
 from openerp.osv import osv, fields
-from openerp import tools
+from openerp import api, models, tools
 
 
 class im_livechat_channel(osv.Model):
@@ -293,3 +293,26 @@ class im_chat_session(osv.Model):
             else:
                 return super(im_chat_session, self).quit_user(cr, uid, session.id, context=context)
 
+
+    def cron_remove_empty_session(self, cr, uid, context=None):
+        groups = self.pool['im_chat.message'].read_group(cr, uid, [], ['to_id'], ['to_id'], context=context)
+        not_empty_session_ids = [group['to_id'][0] for group in groups]
+        empty_session_ids = self.search(cr, uid, [('id', 'not in', not_empty_session_ids), ('channel_id', '!=', False)], context=context)
+        self.unlink(cr, uid, empty_session_ids, context=context)
+
+
+
+class Rating(models.Model):
+
+    _inherit = "rating.rating"
+
+    @api.one
+    @api.depends('res_model', 'res_id')
+    def _compute_res_name(self):
+        # cannot change the rec_name of session since it is use to create the bus channel
+        # so, need to override this method to set the same alternative rec_name as in reporting
+        if self.res_model == 'im_chat.session':
+            current_object = self.env[self.res_model].sudo().browse(self.res_id)
+            self.res_name = ('%s / %s') % (current_object.channel_id.name, current_object.id)
+        else:
+            super(Rating, self)._compute_res_name()
diff --git a/addons/im_livechat/im_livechat_data.xml b/addons/im_livechat/im_livechat_data.xml
index 2f21a321002..8394d25c16d 100644
--- a/addons/im_livechat/im_livechat_data.xml
+++ b/addons/im_livechat/im_livechat_data.xml
@@ -13,6 +13,19 @@
             <field name="action_id" ref="action_client_livechat_menu"/>
             <field name="state">open</field>
         </record>
+
+        <!-- Remove automatically the empty anonoymous sessions -->
+        <record id="ir_cron_remove_empty_session" model="ir.cron">
+            <field name="name">[im_livechat] Remove empty anonymous sessions</field>
+            <field name="interval_number">1</field>
+            <field name="interval_type">days</field>
+            <field name="numbercall">-1</field>
+            <field name="doall" eval="False"/>
+            <field name="model">im_chat.session</field>
+            <field name="function">cron_remove_empty_session</field>
+            <field name="active" eval="True"/>
+        </record>
+
     </data>
 
     <data>
diff --git a/addons/rating/models/rating.py b/addons/rating/models/rating.py
index dab705fc9fa..44d446b4b0c 100644
--- a/addons/rating/models/rating.py
+++ b/addons/rating/models/rating.py
@@ -12,12 +12,11 @@ class Rating(models.Model):
         ('rating_range', 'check(rating >= -1 and rating <= 10)', 'Rating should be between -1 to 10'),
     ]
 
-    @api.multi
+    @api.one
     @api.depends('res_model', 'res_id')
     def _compute_res_name(self):
-        for record in self:
-            name = self.env[record.res_model].sudo().browse(record.res_id).name_get()
-            record.res_name = name and name[0][1] or ('%s/%s') % (record.res_model, record.res_id)
+        name = self.env[self.res_model].sudo().browse(self.res_id).name_get()
+        self.res_name = name and name[0][1] or ('%s/%s') % (self.res_model, self.res_id)
 
     @api.model
     def new_access_token(self):