Error when accessing a course (Onetopic format and Boost theme)

Error description:

With Boost theme, OneTopic course returns an error when attempting to open from the Dashboard. If you open the Drawer you can then access both Courses contents.

Cause:

This can be caused by a combination of the behaviour of the OneTopic format and the course in question having a section highlighted that no longer exists. The OneTopic format is trying to render the highlighted topic by default and it's generating that error when it can find it.

Solution:

1. Change the course format to Topics
2. Pick any topic, click the edit menu, and click "Highlight" to make that topic the highlighted one.
3. [Optional] click "Edit" again and click "Remove Highlight".
4. Change the course format back to "OneTopic"