Clicking "Schema" tab causes a blank screen

[danpalmer]

When clicking the "schema" tab on the right hand side of the window, the app presents an entirely blank screen, and must be quit and re-launched to get back to the editor.

In the developer tools, I can see the error:

Syntax Error: Expected Name, found ) (3729:3)
  3727 |     
  3728 |     includeLinks: Boolean
> 3729 |   ): HTML!
       |   ^
  3730 |