UCS update in webinterface not work

I have problem with Update module in UCS interface. After open Software -> Software update I see this screen:
But nothing happens…

Updating in console is working, UCS is now updated.

Starting univention-upgrade. Current UCS version is 4.4-2 errata291

Checking for local repository:                          none
Checking for package updates:                           none
Checking for app updates:                               none
Checking for release updates:                           none

If new update is available, I see notification in top right corner, but ater click on update, i get same screen " UCS is being updated…"

Server restart not help, still same problem…

How to fix Software update screen ?