Custom Fields not loading slider

This function doesn’t show up in the code but leaves a large blank space below the header. I placed a reference to the metaslider by creating a custom field on the home page. What am I missing here?

function slidedeck_insert(){
        $metaslider_id = getCustomFieldValue('metaslider_id', '');
        if( !empty($metaslider_id) ) {
            ?>
        <div id="slidedeck_wrapper"><div id="slidedeck"> <?php echo do_shortcode( "[metaslider id=" . $metaslider_id . "]" ); ?> </div></div>
        <?php
        }
}
add_action('thematic_belowheader','slidedeck_insert');