WooCommerce Points and Rewards (by WooCommerce)

Plugin: https://woocommerce.com/products/woocommerce-points-and-rewards/

in file \plugins\woocommerce-points-and-rewards\includes\class-wc-points-rewards-manager.php add next code:

if (class_exists('WOOCS')) {
    global $WOOCS;
    if ($WOOCS->is_multiple_allowed) {
        $currrent = $WOOCS->current_currency;
        if ($currrent != $WOOCS->default_currency) {
            $currencies = $WOOCS->get_currencies();
            $rate = $currencies[$currrent]['rate'];
            $amount = $amount / ($rate);
        }
    }
}

if (class_exists('WOOCS')) {

global $WOOCS;

if ($WOOCS->is_multiple_allowed) {

$currrent = $WOOCS->current_currency;

if ($currrent != $WOOCS->default_currency) {

$currencies = $WOOCS->get_currencies();

$rate = $currencies[$currrent]['rate'];

$amount = $amount / ($rate);

}

if (class_exists('WOOCS')) {
    global $WOOCS;
    if ($WOOCS->is_multiple_allowed) {
        $currrent = $WOOCS->current_currency;
        if ($currrent != $WOOCS->default_currency) {
            $currencies = $WOOCS->get_currencies();
            $rate = $currencies[$currrent]['rate'];
            $amount = $amount / ($rate);
        }
    }
}