Weird error when pressing CTRL+S on the main panel dashboard.

[luigimannoni]

I have an extra tab where I do put my website settings (base SEO metas, etc), however everytime I save or change the site name I get this modal with the following error:

The form could not be saved
Exception: undefined
Michnhokn\Log::setSlug(): Argument #1 ($slug) must be of type string, null given, called in /app/site/plugins/kirby3-logger/classes/Logger.php on line 167