diff --git a/addons/account/models/account_move.py b/addons/account/models/account_move.py
index cd8ded3a128..190deeedc53 100644
--- a/addons/account/models/account_move.py
+++ b/addons/account/models/account_move.py
@@ -1278,7 +1278,7 @@ class AccountMove(models.Model):
         param = {'journal_id': self.journal_id.id}
 
         if not relaxed:
-            domain = [('journal_id', '=', self.journal_id.id), ('id', '!=', self.id or self._origin.id), ('name', 'not in', ('/', False))]
+            domain = [('journal_id', '=', self.journal_id.id), ('id', '!=', self.id or self._origin.id), ('name', 'not in', ('/', '', False))]
             if self.journal_id.refund_sequence:
                 refund_types = ('out_refund', 'in_refund')
                 domain += [('move_type', 'in' if self.move_type in refund_types else 'not in', refund_types)]