I found an error in this function rwmb_the_value

[mamunur105]

Although i am not good at english , i Hope i can explain the issue .
I Hope new update you resolve the issue .
I have A live project .I Add a new meta field type="background"
when i implement this code for output .

$css = rwmb_the_value( $field_id, '', '', false );

i need save again All the page . Otherwise showing error . if i have 5000 page or post that time i have no time to save again each page .
i Hope new update you resolve the issue .

here is my code :
// Page Header & Footer Disabling Metabox
$meta_boxes[] = array(
'id' => $prefix.'page_header',
'title' => esc_html__( 'Page Header', 'codexin' ),
'post_types' => array( 'page' ),
'context' => 'normal',
'priority' => 'high',
'fields' => array(

    array(
        'id'   => $prefix.'page_banner_background',
        'name'  => esc_html__( 'Banner Background', 'codexin' ),
        'type' => 'background',
    )
   
) // End fields

); // End codexin_page_header_footer
output :
$banner_css = rwmb_the_value( '_codexin_page_banner_background', array(''), '', false );

Warning: array_filter() expects parameter 1 to be array, string given in /home/yhcizf1aox3h/public_html/humandynamic.dragonlabhq.com/wp-content/themes/codexin/vendors/meta-box/inc/fields/background.php on line 160

Warning: Invalid argument supplied for foreach() in /home/yhcizf1aox3h/public_html/humandynamic.dragonlabhq.com/wp-content/themes/codexin/vendors/meta-box/inc/fields/background.php on line 161