Error after importing document which passed all checks

I'm writing a script to generate JSON that is compatible with the Prismic importer, using the structure from Prismic exporter as a reference for formatting of the object.

I successfully imported and published a page, but gatsby-source-prismic threw the following error:

Cannot read properties of null (reading 'link_type')

My link field looks like this, based on the exported JSON link field:


After I deleted the imported document, the site built successfully again.


I changed the field to be


Or for empty links