Add to cart does not work

Hello, I apologize for my English. I have a problem, products are not added to the cart when using your plugin. There has already been a similar question. I also have a theme from the developer Xtemos. Here is a snippet of code that is responsible for adding products to the cart. I will be grateful if you can help solve the problem.

if( ! function_exists( 'woo_ajax_add_to_cart' ) ) {
	function woo_ajax_add_to_cart() {
		// Get messages
		ob_start();

		wc_print_notices();

		$notices = ob_get_clean();

		// Get mini cart
		ob_start();

		woocommerce_mini_cart();

		$mini_cart = ob_get_clean();

		// Fragments and mini cart are returned
		$data = array(
			'notices' => $notices,
			'fragments' => apply_filters( 'woocommerce_add_to_cart_fragments', array(
					'div.widget_shopping_cart_content' => '<div class="widget_shopping_cart_content">' . $mini_cart . '</div>'
				)
			),
			'cart_hash' => apply_filters( 'woocommerce_add_to_cart_hash', WC()->cart->get_cart_for_session() ? md5( json_encode( WC()->cart->get_cart_for_session() ) ) : '', WC()->cart->get_cart_for_session() )
		);

		wp_send_json( $data );

		die();
	}
}

add_action( 'wp_ajax_woo_ajax_add_to_cart', 'woo_ajax_add_to_cart' );
add_action( 'wp_ajax_nopriv_woo_ajax_add_to_cart', 'woo_ajax_add_to_cart' );