diff --git a/addons/account/models/account_invoice.py b/addons/account/models/account_invoice.py
index 83b3faa19d8..e3bceea033a 100644
--- a/addons/account/models/account_invoice.py
+++ b/addons/account/models/account_invoice.py
@@ -393,7 +393,7 @@ class AccountInvoice(models.Model):
             default_model='account.invoice',
             default_res_id=self.id,
             default_use_template=bool(template),
-            default_template_id=template.id,
+            default_template_id=template and template.id or False,
             default_composition_mode='comment',
             mark_invoice_as_sent=True,
         )
diff --git a/addons/mail/models/mail_message.py b/addons/mail/models/mail_message.py
index aa10557d583..d155ef11065 100644
--- a/addons/mail/models/mail_message.py
+++ b/addons/mail/models/mail_message.py
@@ -857,7 +857,7 @@ class Message(models.Model):
     def _invalidate_documents(self):
         """ Invalidate the cache of the documents followed by ``self``. """
         for record in self:
-            if record.res_id:
+            if record.model and record.res_id:
                 self.env[record.model].invalidate_cache(ids=[record.res_id])
 
     @api.model
diff --git a/doc/cla/individual/sergiocorato.md b/doc/cla/individual/sergiocorato.md
new file mode 100644
index 00000000000..5ac26c3f7ea
--- /dev/null
+++ b/doc/cla/individual/sergiocorato.md
@@ -0,0 +1,9 @@
+Italy, 2017-01-24
+
+I hereby agree to the terms of the Odoo Individual Contributor License Agreement v1.0.
+
+I declare that I am authorized and able to make this agreement and sign this declaration.
+
+Signed,
+
+Sergio Corato sergiocorato@gmail.com https://github.com/sergiocorato