How to resolve Trying to access array offset on value of type bool in errors?

Question

CAPTCHA

Hello. The plugin gives errors Trying to access array offset on value of type bool in, here is a piece of code for them:

self::$plugin_options = get_option( 'wlrp_captcha_options' );
    self::$site_key = self::$plugin_options['site_key'];
    self::$secret_key = self::$plugin_options['secrete_key'];
    self::$theme = self::$plugin_options['theme'];
    self::$language = self::$plugin_options['language'];
    self::$error_message = self::$plugin_options['error_message'];

P/S PHP version 8