Can't open backup page on latest master

Problem

The backup page does not load when clicking on the "Backup" tab on the sidebar. 

Reproduction steps:

1. Initialise a new cluster
2. From the dashboard, try to select the "Backup" tab on the left side. It will not load.

The error message displayed in the console (screenshot attached) suggests that there the HTML for the page is invalid.

Fix

Fix the faulty HTML, or whatever else is causing the backup page to not load.