Line 117 in `phabricator/src/applications/config/management/PhabricatorConfigManagementSetWorkflow.php` says
`->loadOneWhere('namespace = %s AND key = %s', 'default', $key),`
but it should be
`->loadOneWhere('namespace = %s AND configKey = %s', 'default', $key),`
because the `config_entry` table in the `phabricator_config` database has a `configKey` column, but no `key` column.