Issue with "Unsupported path segment {}" error when viewing or editing card documents in Sanity Studio.

export default {
  name: 'card',
  title: 'Card',
  type: 'document',
  fields: [
    {
      name: 'title',
      title: 'Title',
      type: 'string',
    },
    {
      name: 'image',
      title: 'Image',
      type: 'image',
    },
    {
      name: 'rarity',
      title: 'Rarity',
      type: 'reference',
      to: [{type: 'rarity'}],
    },
    {
      name: 'series',
      title: 'Series',
      type: 'reference',
      to: [{type: 'series'}],
    },
    {
      name: 'totalCards',
      title: 'Total Cards',
      type: 'number',
    },
    {
      name: 'codes',
      title: 'Codes',
      type: 'array',
      of: [{type: 'reference', to: [{type: 'code'}]}]
    },
  ],
}