Error when using WP-CLI

PHP Warning:  Trying to access array offset on value of type null in /chroot/home/USER/DOMAIN/html/wp-content/plugins/cryptx/include/functions.php on line 428

Ran into this error when using WP-CLI. When using WP-CLI not all globals are available, if you could just put in a check that the variable exists that should do it. It’s in this part:

/**
 *  add ID to exclude list
 */
function rw_cryptx_insert_post($pID) {
    global $cryptX_var, $post;
    $rev = wp_is_post_revision($pID);
    if($rev) $pID = $rev;
    $b = explode(",", $cryptX_var['excludedIDs']); // LINE 428
    if($b[0] == '') unset($b[0]);
    foreach($b as $x=>$y) {
        if($y == $pID) {
            unset($b[$x]);
            break;
        }
    }
    if (isset($_POST['cryptxoff'])) $b[] = $pID;
    $b = array_unique($b);
    sort($b);
    $cryptX_var['excludedIDs'] = implode(",", $b);
    update_option( 'cryptX', $cryptX_var);
    $cryptX_var = rw_loadDefaults(); // reread Options
}

CryptX 3.3.3.2 / WordPress 6.2 / PHP 8.0.28