Error Upgrading DB to 5.15.alpha1 on Drupal 7: SQL error
What you can try is in line 8 in CRM/Upgrade/Incremental/sql/5.15.alpha1.mysql.tpl you can change it from

SELECT @option_group_id_ps as option_group_id, {localize field='label'}`label`{/localize}, value, ov.name, weight, ov.is_reserved, ov.is_active, is_default


to

SELECT @option_group_id_ps as option_group_id, ov.{localize field='label'}`label`{/localize}, ov.value, ov.name, ov.weight, ov.is_reserved, ov.is_active, ov.is_default