ImmutableConfigException on cron

Hi,

here's the error when i run cron:

Drupal\Core\Config\ImmutableConfigException: Can not set values on immutable configuration
social_stats.cron_settings:social_stats_next_execution. Use
\Drupal\Core\Config\ConfigFactoryInterface::getEditable() to retrieve a mutable configuration object in
Drupal\Core\Config\ImmutableConfig->set() (line 27 of
/var/www/va/web/core/lib/Drupal/Core/Config/ImmutableConfig.php).