I did find an article that details a similar issue: Error "Unexpected Error ... Unable to get property ' ' of undefined or null reference" Viewing Published Workbook | Ta…
That is a very curious behavior. I am curious if the Tableau Desktop version is also 10.4 matching the Tableau Server? Also, what browser is being used?
I may consider opening up a support ticket as well, which can be done at the following link: Support & Services | Tableau Software
Hope this helps!
Cheers, Byrne, Patrick
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I open a support ticket.