Backup & Restore WebApp settings doesn't work

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Hi there,
we sometimes have the problem that some users lost their WebApp settings… that’s not a big problem, but I want to backup the WebApp settings for my users, so I can restore them for the case of falls. I tried this script:
https://kb.kopano.io/display/WIKI/Backup+and+restore+WebApp+settings

https://stash.kopano.io/projects/KSC/repos/webapp-tools/raw/webapp_settings.py?at=18e62672266e6def623a950a73febedca9483c12

The backup is working:
python webapp_settings.py --user username --backup
-> username.json was generated

But when I try to restore the settings I get an error (this are the last lines):

Traceback (most recent call last):
  File "webapp_settings.py", line 47, in <module>
    main()
  File "webapp_settings.py", line 43, in main
    user.store.prop(PR_EC_WEBACCESS_SETTINGS_JSON).set_value(json.dumps(data))
AttributeError: 'Property' object has no attribute 'set_value'

Maybe someone has an idea?
Thank you!

I use this command

python3 /_ScripteAndTools/webapp_admin.py --user User --file=/_local_backup/kopano-backups/User.json --restore

for the restore without problem.

Regards,

Frank