2013 R2 RTC Crashes - How to debug?

I am using NAV 2013 R2 with Serenic. Budgets. When I run a calculation on the budget the RTC Client crashes. How can I find out this error? I tried to debug but it closes when my RTC Client closes. I looked in event viewer and the only thing that looks like an error is below:

Application: Microsoft.Dynamics.Nav.Client.exe

Framework Version: v4.0.30319

Description: The application requested process termination through System.Environment.FailFast(string message).

Message: RecordImplementation internal error: performed rename instead of modify.

Stack:

at System.Environment.FailFast(System.String)

at Microsoft.Dynamics.Nav.Client.WinClient.StartWinFormsClient.HandleGeneralException(System.Exception)

at Microsoft.Dynamics.Nav.Client.WinClient.ExceptionHandler.DoRethrowWithCatchException(System.Exception, Boolean)

at Microsoft.Dynamics.Nav.Client.WinClient.ExceptionHandler.DoHandleThreadException(System.Exception, Boolean)

at Microsoft.Dynamics.Nav.Client.WinClient.ExceptionHandler.WinFormsDispatcherUnhandledException(System.Object, Microsoft.Dynamics.Framework.UI.DispatcherUnhandledExceptionEventArgs)

at Microsoft.Dynamics.Framework.UI.WinForms.WinFormsDispatcher.HandleDispatcherException(System.Object, System.Exception)

at Microsoft.Dynamics.Framework.UI.WinForms.WinFormsDispatcher.OnThreadException(System.Object, System.Threading.ThreadExceptionEventArgs)

at System.Windows.Forms.Application+ThreadContext.OnThreadException(System.Exception)

at System.Windows.Forms.Control.WndProcException(System.Exception)

at System.Windows.Forms.Control+ControlNativeWindow.OnThreadException(System.Exception)

at System.Windows.Forms.NativeWindow.Callback(IntPtr, Int32, IntPtr, IntPtr)

at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG ByRef)

at System.Windows.Forms.Application+ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr, Int32, Int32)

at System.Windows.Forms.Application+ThreadContext.RunMessageLoopInner(Int32, System.Windows.Forms.ApplicationContext)

at System.Windows.Forms.Application+ThreadContext.RunMessageLoop(Int32, System.Windows.Forms.ApplicationContext)

at Microsoft.Dynamics.Nav.Client.WinClient.NavWinFormsClientSession.RunMessagePump()

at Microsoft.Dynamics.Nav.Client.WinClient.NavWinFormsClientSession.RunCore()

at Microsoft.Dynamics.Framework.UI.Windows.ClientSessionBase.Run()

at Microsoft.Dynamics.Nav.Client.WinClient.NavClientErrorHandler.ExecuteAndCatchExceptions(System.Func`1)

at Microsoft.Dynamics.Nav.Client.WinClient.ExceptionHandler.DoExecute(System.Func`1)

at Microsoft.Dynamics.Nav.Client.WinClient.StartWinFormsClient.RunCore()

at Microsoft.Dynamics.Nav.Client.WinClient.StartWinFormsClient.Run(Boolean)

at Microsoft.Dynamics.Nav.Client.WinClient.StartWinFormsClient.RunAndDispose()

at Microsoft.Dynamics.Nav.Client.Program.ExecuteNormally(System.Func`1)

at Microsoft.Dynamics.Nav.Client.Program.Main(System.String[])