PHP Error Notices when Breadcrumbs are disabled

Hi there,

When Breadcrumbs feature is disabled, either through the UI or via

add_action( 'slim_seo_init', function( $plugin ) {
    $plugin->disable( 'breadcrumbs' );
} );

there are PHP Notices fired on most of the pages:

– 2 notices on regular pages and single posts:

Notice: Trying to access array offset on value of type null in /var/www/html/wp-content/plugins/slim-seo/src/Breadcrumbs.php on line 68
Notice: Trying to access array offset on value of type null in /var/www/html/wp-content/plugins/slim-seo/src/Breadcrumbs.php on line 113 

– 2 notices on 404 pages (line 88 instead of 113):

Notice: Trying to access array offset on value of type null in /var/www/html/wp-content/plugins/slim-seo/src/Breadcrumbs.php on line 68
Notice: Trying to access array offset on value of type null in /var/www/html/wp-content/plugins/slim-seo/src/Breadcrumbs.php on line 88 

– 1 notice on blog archive page:
Notice: Trying to access array offset on value of type null in /var/www/html/wp-content/plugins/slim-seo/src/Breadcrumbs.php on line 68

No notice on frontpage.

Thank you!