object reference not set to an instance of an object after change in content

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Simon 15 posts 85 karma points

Mar 06, 2017 @ 09:00

Using Umbraco And Getting Started

Umbraco 7

Hi all

I have a content editor who made a change in Umbraco backoffice about how a link should open. She published the page and our entire website goes down with a Object reference not set to an instance of an object.

Can anybody see what the problem is? Notting in our code is changed.

[NullReferenceException: Object reference not set to an instance of an object.]
   IKAS.Mainsite.Website.Controllers.MasterController.View(MasterViewModel model) +3757
   lambda_method(Closure , ControllerBase , Object[] ) +104
   System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +264
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +34
   System.Web.Mvc.Async.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41() +33
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +59
   System.Web.Mvc.Async.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33() +76
   System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +371
   System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +371
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +60
   System.Web.Mvc.Async.<>c__DisplayClass2a.<BeginInvokeAction>b__20() +32
   System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) +185
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +53
   System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +24
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +22
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +68
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +22
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +53
   System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +39
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +22
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +53
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +399
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +137

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Dennis Adolfi 1082 posts 6446 karma points MVP 5x c-trib

Mar 06, 2017 @ 09:09

0

Spontaneously, it feels like you're missing a nullcheck somewhere in the code. It can be anything but from the looks of your error message I would start looking in your MasterController for any code statements where you might use lambda Where(), First(), Last() etc and make sure you add null checks (if's) to prevent the infamous "Object reference not set to an instance of an object" error.

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Stefano 61 posts 313 karma points c-trib

Mar 06, 2017 @ 09:13

0

Try to look in MasterController.View(MasterViewModel model) for something that is missing a null check.

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