We are getting the error once we submit the `Sitecore 9.1 form`. This is happening when we enable the checkbox `Is tracking Enable` in Sitecore core form. 
and this error is not with Standalone role, only with `CD and CM server`.

**The error is:** 

<pre>
[ArgumentException: alias should not be null or an empty string.
Parameter name: alias]
   Sitecore.Framework.Conditions.RequiresValidator`1.ThrowExceptionCore(String condition, String additionalMessage, ConstraintViolationType type) +100
   Sitecore.Framework.Conditions.Throw.ValueShouldNotBeNullOrAnEmptyString(ConditionValidator`1 validator, String conditionDescription) +121
   Sitecore.Framework.Conditions.ValidatorExtensions.IsNotNullOrEmpty(ConditionValidator`1 validator) +41
   Sitecore.Marketing.Core.Extensions.ConditionValidatorExtensions.IsValidAlias(ConditionValidator`1 validator) +139
   Sitecore.Marketing.Definitions.DefinitionManagerBase`2.GetByAlias(String alias, CultureInfo cultureInfo, Boolean includeInactiveVersion) +87
   Sitecore.Analytics.Data.DefinitionCollection`1.get_Item(String name) +156
   Sitecore.Analytics.Tracking.PageContext.Register(PageEventData pageData) +437
   Sitecore.ExperienceForms.Analytics.Tracking.FormEventsTracker.RegisterFormBegin(FormTrackingEventData pageEventData) +374
   Sitecore.ExperienceForms.Analytics.Tracking.FormEventsTracker.RegisterEvent(TEventData trackingEventData) +100
   Sitecore.ExperienceForms.Mvc.FormRenderingContext.RegisterFormEvent(FormEventData formEventData) +117
   Sitecore.ExperienceForms.Mvc.Controllers.FormBuilderController.Index(FormDataModel data) +271
   lambda_method(Closure , ControllerBase , Object[] ) +139
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +35
   System.Web.Mvc.Async.&lt;&gt;c.&lt;BeginInvokeSynchronousActionMethod&gt;b__9_0(IAsyncResult asyncResult, ActionInvocation innerInvokeState) +39
   System.Web.Mvc.Async.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult) +70
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +42
   System.Web.Mvc.Async.AsyncInvocationWithFilters.&lt;InvokeActionMethodFilterAsynchronouslyRecursive&gt;b__11_0() +72
   System.Web.Mvc.Async.&lt;&gt;c__DisplayClass11_1.&lt;InvokeActionMethodFilterAsynchronouslyRecursive&gt;b__2() +387
   System.Web.Mvc.Async.&lt;&gt;c__DisplayClass11_1.&lt;InvokeActionMethodFilterAsynchronouslyRecursive&gt;b__2() +387
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +42
   System.Web.Mvc.Async.&lt;&gt;c__DisplayClass3_6.&lt;BeginInvokeAction&gt;b__3() +50
   System.Web.Mvc.Async.&lt;&gt;c__DisplayClass3_1.&lt;BeginInvokeAction&gt;b__5(IAsyncResult asyncResult) +188
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +38
   System.Web.Mvc.&lt;&gt;c.&lt;BeginExecuteCore&gt;b__152_1(IAsyncResult asyncResult, ExecuteCoreState innerState) +26
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +68
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +52
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +39
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +38
   System.Web.Mvc.&lt;&gt;c.&lt;BeginProcessRequest&gt;b__20_1(IAsyncResult asyncResult, ProcessRequestState innerState) +40
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +68
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +38
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +648
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +213
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +131

</pre>