Electro v2 - Do not show savings if the product is not on sale

functions.php

function electro_onsale_product( $args = array() ) {

    if ( is_woocommerce_activated() ) {

        $defaults   = array(
            'section_title' => wp_kses_post( __( '<span class="highlight">Special</span> Offer', 'electro' ) ),
            'section_class' => '',
            'show_savings'  => true,
            'savings_in'    => 'amount',
            'savings_text'  => esc_html__( 'Save', 'electro' ),
        );

        if ( isset( $args['product_choice'] ) ) {
            switch( $args['product_choice'] ) {
                case 'random':
                    $args['orderby'] = 'rand';
                break;
                case 'recent':
                    $args['orderby']    = 'date';
                    $args['order']      = 'DESC';
                break;
                case 'specific':
                    $args['orderby']    = 'post__in';
                    $args['ids']        = $args['product_id'];
                    $args['post__in']   = array_map( 'trim', explode( ',', $args['product_id'] ) );
                break;
            }
        }

        $args       = wp_parse_args( array( 'per_page'  => 1 ), $args );
        $args       = wp_parse_args( $args, $defaults );
        $products   = Electro_Products::sale_products( $args );

        extract( $args );

        if ( $products->have_posts() ) {

            while ( $products->have_posts() ) : $products->the_post(); 
        ?>
        <section class="section-onsale-product <?php echo esc_attr( $section_class ); ?>">

            <?php if ( ! empty ( $section_title ) || $show_savings ) : ?>

            <header>

                <?php if ( ! empty ( $section_title ) ) : ?>

                <h2 class="h1"><?php echo wp_kses_post( $section_title ); ?></h2>

                <?php endif ; ?>

                <?php global $product; if ( $product->is_on_sale() && $show_savings ) : ?>

                <div class="savings">
                    <span class="savings-text">
                    <?php
                        
                        echo sprintf( '%s %s', $savings_text, Electro_WC_Helper::get_savings_on_sale( $product, $savings_in ) );
                    ?>
                    </span>
                </div>

                <?php endif; ?>

            </header>

            <?php endif; ?>
            <div class="onsale-products">
                <?php wc_get_template_part( 'templates/contents/content', 'onsale-product' ); ?>
            </div>

        </section>

        <?php

            endwhile;

            woocommerce_reset_loop();
            wp_reset_postdata();
        }
    }
}

This functions doesn't work. (