Exception while accessing Facebook.Client.Session.ActiveSession.CurrentAccessTokenData

[WheretIB]

On access to Facebook.Client.Session.ActiveSession.CurrentAccessTokenData, GetSessionData() might throw an exception:
https://github.com/facebook-csharp-sdk/facebook-winclient-sdk/blob/master/Source/Facebook.Client/Session.cs#L184

There is an error in XML document (2, 2). at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, Object events)
at System.Xml.Serialization.XmlSerializer.Deserialize(Stream stream)
at Facebook.Client.AccessTokenDataIsolatedStorageCacheProvider.GetSessionData()
at Facebook.Client.Session.get_CurrentAccessTokenData()

Broken session data will block further login attempts.