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Citavi crashes with System.NullReferenceException

Citavi (Windows) is a very important software for academics and students. I created a wine bottle for it and installed different Net Franwework versions inside it since Citavi requires that. There was an improvement: Without the Framework installs, Citavi wouldn't install. Now it installs and even launches. However, upon launch, an error is produced and the app hangs loading. The error is:

Technical Information for the Citavi Team:
System.NullReferenceException: Object reference not set to an instance of an object.
   at SwissAcademic.Citavi.Shell.RegistryHelper.RegisterCustomUriScheme()
   at SwissAcademic.Citavi.Shell.Bootstrapper.<BootAsync>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at SwissAcademic.Citavi.Shell.SplashForm.<loadTimer_Tick>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<>c.<ThrowAsync>b__6_0(Object state)&```

Any clue? I'm not a coder.

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