Unable to delete calendar in v12

I have added a calendar and some events. maybe a 100 or more and and when I try to delete the calendar via teh UX it pops up the exception banner and fails 

Looking at the db the calendar value is marked as IsDeleted but not all the events are, teh calendar also disappears from the list of active and deleted applications 

The exception is 

System.NullReferenceException: Object reference not set to an instance of an object.
at Telligent.Evolution.Calendar.Plugins.RestApi.CalendarRestEndpoints.Delete(IRestRequest request)
at Telligent.Evolution.Rest.Framework.Infrastructure.RestPluginHttpHandler.ProcessRequest(HttpContextBase context, HttpResponse httpResponse)

There was also a second exception which may be related 

System.ArgumentException: An element with the same key 'IsCancelled' already exists in the ExpandoObject.
at System.Dynamic.ExpandoObject.TrySetValue(Object indexClass, Int32 index, Object value, String name, Boolean ignoreCase, Boolean add)
at System.Dynamic.ExpandoObject.TryAddMember(String key, Object value)
at Telligent.Evolution.Platform.Auditing.AuditTrackingService.TrackEditRecursive(AuditLogEntry entry, Object original, Object edited, Int32 depth, IList`1 path, IDictionary`2 editData)
at Telligent.Evolution.Platform.Auditing.AuditTrackingService.TrackEdit(AuditLogEntry entry, IAuditable original, IAuditable edited)
at Telligent.Evolution.Platform.Auditing.AuditingService.Edited[T](T originalEntity, T editedEntity)

This is using 12.0.1.16198

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