What version are you running?
3.0RC1
What's the URL of the page containing the problem?
Intranet, not accessible outside of Nokia
What steps will reproduce the problem?

Create review
Click Update->Update diff


What is the expected output? What do you see instead?
Expected: Dialog for diff update should appear.

Actuall: Nothing happens, just error in consol log

Uncaught ReferenceError: selectParentDiffText is not defined

    at render (reviews.min.d5ed5d3e28ec.js:7)

    at render (reviews.min.d5ed5d3e28ec.js:7)

    at r._onUpdateDiffClicked (reviews.min.d5ed5d3e28ec.js:6)

    at HTMLAnchorElement.dispatch (jquery-1.11.1.min.8101d596b2b8.js:3)

    at HTMLAnchorElement.r.handle (jquery-1.11.1.min.8101d596b2b8.js:3)

What operating system are you using? What browser?
Arch Linux, Vivaldi 1.11.917.43, Firefox 55.03
Please provide any additional information below.
This is rather critucal issue as basic Web Interface element is not working.