Fatal error in WP-PostRatings plugin

Buenas tardes,

Tras actualizar varios plugins, me he dado cuenta que en la pagina donde deberia salir la opción para puntuar la entrada(plugin WP-PostRatings) me aparece este error:

Fatal error: Call to undefined function has_header_image() in /home/xxxxxxx/public_html/blog/wp-content/plugins/wp-postratings/wp-postratings.php on line 1087

Ademas debido a este error, tampoco carga el plugin para dejar un comentario, el footer, …

Os pego un trozo del codigo al que hace referencia el error:

}
if( empty( $site_logo ) ) {
if( has_header_image() ) {
$header_image = get_header_image();
if( ! empty( $header_image ) ) {
$site_logo = $header_image;
}
}

Si desactivo el plugin el resto de la pagina carga perfectamente.

Podeis echarme una mano?

Muchas Gracias

English:
Good afternoon,

After updating several plugins, I noticed that on the page where I should leave the option to score the text (plugin WP-PostRatings) I get this error:

Fatal error: Call to undefined function has_header_image () in /home/xxxxxxx/public_html/blog/wp-content/plugins/wp-postratings/wp-postratings.php on line 1087

Also because of this error, it does not load the next plugin to leave a comment, the footer, …

I write a piece of code to which the error refers:

}
if( empty( $site_logo ) ) {
if( has_header_image() ) {
$header_image = get_header_image();
if( ! empty( $header_image ) ) {
$site_logo = $header_image;
}
}

If I disable the plugin, the rest of the page loads perfectly.

Can you help me?

Thank you so much