E_WARNING in bulk-image-title-attribute/core/Option.php:32

In a context where not post has been loaded and therefore $post is not defined, the plugin will trigger warnings in bulk-image-title-attribute/core/Option.php

public static function post_meta($key)
{
    global $post;
    return get_post_meta($post->ID, $key, true); // E_WARNING triggered here
}

Please check whether $post is set before accessing properties.