Fatal Error on Hide Posts Settings page

WP 5.7.2
PHP 8
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If there is nothing checked on Settings Page, whp_enabled_post_types will be assigned to empty string but it’s expected to be an array in page template.

Not sure, about the place, but I would suggest to add a code something like this:
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public function settings() {
…
$enabled_post_types = get_option( ‘whp_enabled_post_types’ );

if( !is_array($enabled_post_types) ) {
$enabled_post_types = [];
}
…
}