diff --git a/addons/account/models/account_move.py b/addons/account/models/account_move.py
index 61323b8b62d..8f3ff680217 100644
--- a/addons/account/models/account_move.py
+++ b/addons/account/models/account_move.py
@@ -1120,6 +1120,7 @@ class AccountMoveLine(models.Model):
 
         where_clause = ""
         where_clause_params = []
+        tables = ''
         if domain:
             query = self._where_calc(domain)
             tables, where_clause, where_clause_params = query.get_sql()