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Object reference not set to an instance of an object.

System.NullReferenceException: Object reference not set to an instance of an object.
   at StackExchange.Profiling.MiniProfiler.StopImpl()
   at StackExchange.Profiling.BaseProfilerProvider.StopProfiler(MiniProfiler profiler)
   at StackExchange.Profiling.WebRequestProfilerProvider.Stop(Boolean discardResults)
   at Umbraco.Web.Profiling.WebProfiler.UmbracoApplicationEndRequest(Object sender, EventArgs e)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)