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-rw-r--r--addons/mass_mailing/models/mail_thread.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/addons/mass_mailing/models/mail_thread.py b/addons/mass_mailing/models/mail_thread.py
index 8e4ee298c67..f26aee7ff4a 100644
--- a/addons/mass_mailing/models/mail_thread.py
+++ b/addons/mass_mailing/models/mail_thread.py
@@ -35,7 +35,7 @@ class MailThread(models.AbstractModel):
""" Override to update the parent mail statistics. The parent is found
by using the References header of the incoming message and looking for
matching message_id in mail.mail.statistics. """
- if message.get('References'):
+ if message.get('References') and routes:
message_ids = [x.strip() for x in decode_smtp_header(message['References']).split()]
self.env['mail.mail.statistics'].set_opened(mail_message_ids=message_ids)
self.env['mail.mail.statistics'].set_replied(mail_message_ids=message_ids)