I'm facing null reference issue with multiple CM Sitecore Setup. Below is the environment details.

Servers 2

Sitecore 8.0 update 6

Very minimal access to infrastructure.

DisableClientBrowsing is set to true.

Scalability Setting config is disabled.

ERROR Application error. Exception: System.Web.HttpUnhandledException Message: Exception of type 'System.Web.HttpUnhandledException' was thrown. Source: System.Web
at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequest(HttpContext context) at ASP.sitecore_shell_applications_content_manager_default_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\68275d57\e975e24f\App_Web_py4csts0.3.cs:line 0
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Nested Exception

Exception: System.Reflection.TargetInvocationException Message: Exception has been thrown by the target of an invocation. Source: mscorlib at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Sitecore.Reflection.ReflectionUtil.InvokeMethod(MethodInfo method, Object[] parameters, Object obj) at Sitecore.Web.UI.Sheer.ClientPage.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Nested Exception

Exception: System.NullReferenceException Message: Object reference not set to an instance of an object. Source: Sitecore.Client at Sitecore.Shell.Applications.ContentManager.ContentEditorForm.OnLoad(EventArgs e)

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2 Answers 2


Scalability Settings configuration must be enabled for a multiple CM setup.

What most likely happens here is, that you're clicking a content item that the CM that has since been deleted on one of the other CM instances but the change has not been reflected. This is what Scalability Settings does for you.

You must also ensure your EventQueues are enabled. I believe Scalability Settings config does this, but double check it to be sure.

More info: Setting up multiple CM servers

  • I have enabled Scalability Settings file on both CM servers and now have unique instance name like SCCM1 and SCCM2. I am still facing the same issue. Do you know the name of Event Queue settings. I'm unable to find the same. Nov 6, 2017 at 11:00

@Mohit Dharmadhikari

<setting name="EnableEventQueues" value="true"/>

It is under Sitecore.config you can refer https://sitecorebasics.wordpress.com/2011/03/19/basics-of-sitecore-event-queue/ blog for more details on this.

  • Thanks. This setting is already set to true in my application. Nov 9, 2017 at 8:35
  • Could you please elaborate your answer? Right now, it doesn't say what you should do with the piece of XML you posted. So you're getting dangerously close to a link-only answer. Nov 9, 2017 at 9:44

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