Link on header image

Hi,
I’m having problems adding a link to the header image to get back to the homepage.
Here is the code I have in my header.php:

<a href="<?php echo esc_url( home_url( '/' ) ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home"><header id="masthead" class="site-header" role="banner" <?php if ( ! empty( $header_image ) ) { ?>style="background:url(<?php header_image(); ?>) no-repeat center center; background-size: cover; height:<?php echo get_custom_header()->height; ?>px;" <?php } ?>>
		<hgroup>
			<div class="site-text">
				<h1 class="site-title"><a href="<?php echo esc_url( home_url( '/' ) ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home"><?php bloginfo( 'name' ); ?></a></h1>
				<h2 class="site-description"><?php bloginfo( 'description' ); ?></h2>
			</div>
		</hgroup>
	</header></a><!-- #masthead .site-header -->

Any idea why it does not work? And how to make it work of course ??
Thx in advance for your help.