Hangfire Dashboard yellow page with NullReferenceException

bug?
1

Sometimes while using Hangfire Dashboard with Redis storage I got a yellow page with this error:

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 


[NullReferenceException: Object reference not set to an instance of an object.]
   Hangfire.Dashboard.HtmlHelper.ServerId(String serverId) +44
   Hangfire.Dashboard.Pages.ProcessingJobsPage.Execute() +2841
   Hangfire.Dashboard.RazorPage.TransformText(String body) +26
   Hangfire.Dashboard.RazorPage.ToString() +7
   Hangfire.Dashboard.RazorPageDispatcher.Dispatch(DashboardContext context) +65
   Hangfire.Dashboard.<>c__DisplayClass1_2.<UseHangfireDashboard>b__1(IDictionary`2 env) +341
   Microsoft.Owin.Mapping.<Invoke>d__0.MoveNext() +274
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.<RunApp>d__5.MoveNext() +182
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +92
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +58
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.<DoFinalWork>d__2.MoveNext() +180
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.StageAsyncResult.End(IAsyncResult ar) +69
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContext.EndFinalWork(IAsyncResult ar) +64
   System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +380
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
2

Which Redis storage client are you using? There is one old old open-source one, and then the paid-for version shipping with Hangfire.Pro.

3

@burningice I’m using the paid version in Hangfire.Pro.

4

Then you’re entitled to private email support so try writing support@hangfire.io