[3.5.4.1] Unable to clear post when using editor with SteemPlus enabled

[tobias-g1]

Expected behavior

When using the editor option when creating a post on Steemit, I should be able to clear the body of the post.

Actual Behaviour

With SteemPlus enabled I cannot clear the body of a post when using the editor option on Steemit.

Steps to reproduce

1. From a fresh install download SteemPlus here
2. Complete the on-boarding flow and sign in via SteemConnect
3. You will be redirected to Steemit.com (if you're already on the site, refresh to ensure the SteemPlus extension is working as expected)
4. Click on create a new post.
5. Click on the editor option shown to the top right of the post body/text area.
6. Write "This is a test body"
7. Click on the clear all button shown at the bottom of the page.
8. Note that the body is not cleared.

Error

The following error is shown upon click of the clear button when using the editor.

select_reward_dropdown.js:62 

Uncaught TypeError: Cannot set property 'value' of undefined
    at HTMLButtonElement.<anonymous> (select_reward_dropdown.js:62)
    at HTMLButtonElement.dispatch (jquery.js:1627)
    at HTMLButtonElement.q.handle (jquery.js:1589)

Environment

• Browser: Google Chrome (Version 65.0.3325.162 (Official Build) (64-bit))
• Device: MacBook Pro (Retina, 15-inch, Late 2013)
• Operating system: MacOS HighSierra Version 10.13
• Application Version of Testing: 3.5.4.1

Recording of Issue

The following issue can be seen in the view below:

https://www.youtube.com/watch?v=V4esW0gefnE&feature=youtu.be

Note that within the video I also show that it works as expected with SteemPlus disabled.