module-posts with link in header

<?php $id_attr = '' !== $module_id ? sprintf( ' id="%1$s"', esc_attr( $module_id ) ) : ''; ?>
<div <?php echo $id_attr ?> class="module post-module et_pb_extra_module <?php echo esc_attr( $module_class ); ?>" style="border-top-color:<?php echo esc_attr( $border_top_color ); ?>">
    <div class="module-head">
        <?php
            $idObj = get_category_by_slug($title);
            $id = $idObj->term_id;
            $link = get_category_link( $id );
        ?>
        <h1 style="color:<?php echo esc_attr( $module_title_color ); ?>"><a href="<?php echo $link; ?>"><?php echo esc_html( $title ); ?></a></h1>
        <span class="module-filter"><?php echo esc_html( $sub_title ); ?></span>
    </div>
    <?php require locate_template( 'module-posts-content.php' ); ?>
</div>