Exception when getting issues: Issue 'XXX' has zero or multiple string values for field 'subsystem'.

[SaschaWeisenberger]

We don't have fields of type subsystem in this project, so I wonder why it even tries to parse it.
Here is my code:
`var ytClient = new YouTrackClient("xxx", "xxx", "xxx");

        var projectRepo = ytClient.GetProjectRepository();

        var project = projectRepo.GetProject("SD");

        foreach (var issue in project.GetIssues())

        {

            Console.WriteLine(issue.Description);

        }`

At "GetIssues" the exception is thrown.

EDIT:
I provided an empty string as defaultValue here:
https://github.com/Saulis/YouTrack.Rest/blob/master/YouTrack.Rest/Deserialization/Issue.cs#L89
Now it works.