H5P Hub doesn't work

Hi

I find that when I activate H5P Hub in Settings hub doesn't work.

I've checked this problem on 2 instalations on different server from different browsers (Chrome i Opera)

See screenshot here

Information from Console:

Uncaught TypeError: H5P.HubClient is not a constructor

    at new ns.SelectorHub (h5peditor-selector-hub.js?ver=1.13.1:42)

    at new ns.LibrarySelector (h5peditor-library-selector.js?ver=1.13.1:42)

    at Object.<anonymous> (h5peditor-editor.js?ver=1.13.1:159)

    at c (jquery.js?ver=1.13.1:2)

    at Object.fireWith [as resolveWith] (jquery.js?ver=1.13.1:2)

    at k (jquery.js?ver=1.13.1:4)

    at XMLHttpRequest.r (jquery.js?ver=1.13.1:4)

PHP7.2.4

MySQL5.7.24

WordPress5.1.1

Any advise what I can do?

Thank you in advanced

BR

Krzysztof