Warning Search Page

The code gives a notice in the search.php file as it has $ post-> ID, the solution is to add two lines:

function oh_add_script() {
    global $post;
    <strong>if (!isset($post)) return;</strong>
    $output = get_post_meta($post->ID,'_oh_add_script_header',true);
    echo stripslashes($output);
    $sogo_header_footer =  get_option('sogo_header_footer');
    if(isset($sogo_header_footer['oh_header'])){
        echo stripslashes($sogo_header_footer['oh_header']);
    }

}
function oh_add_script_footer() {
    global $post;
    <strong>if (!isset($post)) return;</strong>
    $output = get_post_meta($post->ID,'_oh_add_script_footer',true);
    echo stripslashes($output);
    $sogo_header_footer =  get_option('sogo_header_footer');
    if(isset($sogo_header_footer['oh_footer'])){
        echo stripslashes($sogo_header_footer['oh_footer']);
    }

}