diff --git a/trytond/trytond/backend/sqlite/table.py b/trytond/trytond/backend/sqlite/table.py
index efb1fef2f2..b27736c29e 100644
--- a/trytond/trytond/backend/sqlite/table.py
+++ b/trytond/trytond/backend/sqlite/table.py
@@ -279,7 +279,7 @@ class TableHandler(TableHandlerInterface):
         ident = self.convert_name(self.table_name + "_" + ident)
         if database.has_constraint(constraint):
             where = ''
-            if hasattr(constraint, 'where'):
+            if getattr(constraint, 'where', None):
                 where = ' WHERE ' + str(constraint.where)
             cursor.execute(
                 'CREATE UNIQUE INDEX IF NOT EXISTS %s ON %s (%s) %s' % (