NullReferenceException with Owin

Question

I've just cloned a project to a new machine and I'm getting a hard-to-debug NullReferenceException on a MVC site with OWIN:

[NullReferenceException: Object reference not set to an instance of an object.]
   Microsoft.Owin.Security.Cookies.<AuthenticateCoreAsync>d__0.MoveNext() +664
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
   System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() +24
   Microsoft.Owin.Security.Infrastructure.<BaseInitializeAsync>d__2.MoveNext() +860
   System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +93
   System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +52
   System.Runtime.CompilerServices.TaskAwaiter.GetResult() +21
   Microsoft.Owin.Security.Infrastructure.<Invoke>d__0.MoveNext() +427
   System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +22
   Microsoft.Owin.Host.SystemWeb.Infrastructure.ErrorState.Rethrow() +33
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.StageAsyncResult.End(IAsyncResult ar) +150
   Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.IntegratedPipelineContext.EndFinalWork(IAsyncResult ar) +42
   System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +415
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

It occurs after

[assembly: OwinStartupAttribute(typeof(Website.Startup))]
namespace Website
{
    public partial class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            ConfigureAuth(app);
        }
    }
}

but that's as much as I can discern as F10ing after this throws the exception - it never reaches the constructor of the first controller.

Has anyone experienced this before and/or can point me in the direction of what could be the cause of the error?

score 8 · Answer 1 · answered Mar 11 '15 at 12:34

8

The solution above didn't help me however I finally found the answer after trying many things.

I develop multiple solutions concurrently and something must have been getting tangled in the localhost cookies (each solution runs on a different localhost port). After clearing my localhost cookies the issue was resolved.

answered Mar 11 '15 at 12:34

George Harnwell

784
2
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19

1

I had it before, solved it before and didn't remember... Thanks for your answer, this did the stupid trick :). – Jelle Oosterbosch Oct 09 '15 at 14:33

score 6 · Accepted Answer · answered Jan 07 '15 at 11:51

6

Updating OWIN from v2 to v3 seems to fix this issue.

It's worth noting that all OWIN related packages should be updated too.

answered Jan 07 '15 at 11:51

dav_i

27,509
17
104
136

score 0 · Answer 3 · answered Dec 29 '15 at 07:44

0

Updating from OWIN v3.0 to v3.1 fixed the problem for me.

answered Dec 29 '15 at 07:44

De Wet Ellis

720
6
7

NullReferenceException with Owin

3 Answers3

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