Setup a content test failed with NullReferenceException

Question

I am new to Sitecore. We are using Sitecore SXA and Sitecore 9.3. I need to set up a simple A/B rendering test. When I provide a variation for the test in Experience Editor and click ok (see Picture below),

Then press save button, the page becomes unavailable and throws the following error:

[NullReferenceException: Object reference not set to an instance of an object.]
Sitecore.ContentTesting.Pipelines.EvaluateTestExposureBase`1.Process(TPipelineArgs args) (Object , Object )
Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain, Boolean failIfNotExists) Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain)
Sitecore.Mvc.Pipelines.PipelineService.RunPipeline(String pipelineName, TArgs args)
Sitecore.Mvc.Routing.RouteHttpHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData)
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Does anyone how to fix it? I tried to deploy all Market Definitions, however, it didn't help. Thanks in advance.

Answer 1

In my case, the solution was to accept cookie of website. However, to make it work without cookie consent, I think you need to go to support since it is bug of Sitecore (https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB0647546).