Error in Seo.php line 165 when site doesn't have a 'payoff' configured in config.yaml

[LeoEurope]

My site doesn't use a 'payoff' so in /config/bolt/config.yaml the whole payoff section is commented out.

The bolt-seo extension doesn't seem to like it as it expects a value there. It fails with :
Argument 1 passed to Appolo\BoltSeo\Seo\Seo::cleanUp() must be of the type string, null given, called in /home/user/www/example.com/vendor/appolodev/bolt-seo/src/Seo/Seo.php on line 165

Line 165 reads:
$description = $this->cleanUp($this->boltConfig->get('general/payoff'));

It makes no difference if I leave the payoff blank or comment it out altogether. The plugin expects a payoff and errors out if there is none.