TypeError: Class extends value constructor [..] is not a constructor or null

[Znarkus]

    TypeError: Class extends value constructor(attributes, options) {
          proto.constructor.apply(this, arguments)
          const virtuals = this.v...<omitted>... } is not a constructor or null

We're getting this after upgrading to v. 1.0.0
If we deactivate the plugin, the error disappears.

  const bookshelf = new Bookshelf(options)

  bookshelf
    .plugin('bookshelf-virtuals-plugin')

Node version 14.15.1

Are we doing something weird?

[robertofrontado]

I'm experiencing the same issue, did you manage to solve it? @Znarkus