self optimizing block error

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Hi I'm getting this error when after deploying self optimizing block to a test server. This only occurs in Google Chrome, works in Firefox and IE. Works in Chrome on localhost. I'm guessing this is related to http://world.episerver.com/Modules/Forum/Pages/Thread.aspx?id=72181&epslanguage=en

The error/request occurs when clicking on the different variants and seems to be related to the JSON request. Any ideas on how to solve this?

 

 

Stack Trace:

[ArgumentNullException: Value cannot be null.
Parameter name: value]
System.Web.HttpHeaderCollection.SetHeader(String name, String value, Boolean replace) +12602979
EPiServer.Shell.Services.Rest.RestHttpHandler.ValidateAntiForgeryToken(HttpContextBase httpContext) +203
EPiServer.Shell.Services.Rest.RestHttpHandler.ProcessRequest(HttpContextBase httpContext) +109
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +913
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +165

#85169
Apr 16, 2014 13:54
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