diff --git a/addons/account/models/account_invoice.py b/addons/account/models/account_invoice.py
index 58fab13d628..a16dfcb83f5 100644
--- a/addons/account/models/account_invoice.py
+++ b/addons/account/models/account_invoice.py
@@ -397,7 +397,12 @@ class AccountInvoice(models.Model):
         if self.company_id.invoice_reference_type == 'invoice_number':
             seq_suffix = self.journal_id.sequence_id.suffix or ''
             regex_number = '.*?([0-9]+)%s$' % seq_suffix
-            identification_number = int(re.match(regex_number, self.number).group(1))
+            exact_match = re.match(regex_number, self.number)
+            if exact_match:
+                identification_number = int(exact_match.group(1))
+            else:
+                ran_num = str(uuid.uuid4().int)
+                identification_number = int(ran_num[:5] + ran_num[-5:])
             prefix = self.number
         else:
             #self.company_id.invoice_reference_type == 'partner'