Warning: Invalid argument

I keep getting these warnings:

Warning: Invalid argument supplied for foreach() in /home/customer/www/blackjackreview.com/public_html/wp/wp-content/plugins/giveasap/admin/giveasap-cpt-metabox.php on line 416

Any ideas? Code from PHP file shown below.

function giveasap_prizes_metabox_field_validate( $data ) {

foreach ( $data as $index => $prize_fields ) {
    $data[ $index ]['title'] = sanitize_text_field( $prize_fields['title'] );
}

return $data;

}

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