Desk tool crashing when converting schema to Sanity V3, solved by removing empty "media" tag.

export default {
  name: 'post',
  title: 'Post',
  type: 'document',
  groups: [
    {
      name: 'main',
      title: 'Main',
      default: true,
    },
    {
      name: 'seo',
      title: 'SEO',
    },
  ],
  fields: [
    {
      name: 'meta',
      title: 'Meta infomation',
      type: 'metaObject',
      group: 'seo',
    },
    {
      name: 'title',
      title: 'Title',
      type: 'string',
      validation: (Rule) => Rule.required(),
      group: 'main',
    },
    {
      name: 'slug',
      title: 'Slug',
      type: 'slug',
      options: {
        source: 'title',
        maxLength: 96,
      },
      description:
        'Click generate to auto-generate a slug based on the title. Slug is used for the URL of the page. Once a slug is created it should not be modified. In the event a slug must be modified, a task will need to be created for the fronted team to put in a redirect.',
      validation: (Rule) => Rule.required(),
      group: 'main',
    },
    {
      name: 'publishedAt',
      title: 'Published at',
      type: 'datetime',
      validation: (Rule) => Rule.required(),
      group: 'main',
    },
    // {
    //   name: 'author',
    //   title: 'Author',
    //   type: 'reference',
    //   to: { type: 'author' },
    // },
    {
      name: 'useYtThumbnail',
      title: 'Use YouTube Thumbnail as Post Thumbnail',
      type: 'boolean',
      description:
        'If toggled on, the thumbnail from the Youtube video will be used as the main image for the post.',
      group: 'main',
      initialValue: false,
    },
    {
      name: 'mainImage',
      title: 'Post Thumbnail',
      description:
        'This image will be used as the thumbnail for the post on the blog index.',
      type: 'image',
      group: 'main',
      hidden: ({ document }) => document.useYtThumbnail,
    },
    {
      name: 'categories',
      title: 'Categories',
      type: 'array',
      of: [{ type: 'reference', to: { type: 'category' } }],
      group: 'main',
    },
    {
      name: 'excerpt',
      title: 'Excerpt',
      type: 'text',
      description:
        'The text that will be displayed on the blog listings page. If no description is set, the first 120 characters of the body will be used.',
      group: 'main',
      rows: 3,
    },
    {
      name: 'body',
      title: 'Body',
      type: 'blockContent',
      group: 'main',
    },
  ],

  preview: {
    select: {
      title: 'title',
      author: 'author.name',
    },
    prepare({ title, subtitle }) {
      return {
        title: title,
        subtitle: subtitle,
        media: '',
      }
    },
  },
}