Undefined array key “rest_route”

Hello,

I’m seeing a PHP warning to the PHP log when browsing the admin of a site.

PHP message: PHP Warning: Undefined array key "rest_route" in .../public/wp-content/plugins/stellarpay/src/Integrations/WooCommerce/FeatureSupport/ReactBasedPaymentSettings.php on line 114

Checking the source within the isWoocommerceAdminPaymentsProviderRestApiRequest() function on line 110, there’s an assumption that $GLOBALS['wp']->query_vars['rest_route'] exists on line 114.

Above this line, there is a check of:

if (!WC()->is_rest_api_request()) {
    return false;
}

Can this be expanded to also check the variable exists? e.g.

if (!WC()->is_rest_api_request() || empty( $GLOBALS['wp']->query_vars['rest_route'] )) {
    return false;
}