BillCacy

using System;
using Sitecore.Abstractions;
using Sitecore.Analytics.Pipelines.StartTracking;
using Sitecore.Data;

namespace YOURNAMESPACE.Analytics.Pipelines.StartTracking
{
    public class ProcessQueryStringCampaignEx : ProcessQueryStringCampaign
    {
        public ProcessQueryStringCampaignEx() : base() { }

BillCacy

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/" xmlns:set="http://www.sitecore.net/xmlconfig/set/" xmlns:role="http://www.sitecore.net/xmlconfig/role/">
  <sitecore role:require="Standalone or ContentDelivery or ContentManagement">
    <pipelines>
      <startTracking>
          <!-- Patched to handle instances where campaign is expired but can still be triggered -->
          <processor type="Sitecore.Analytics.Pipelines.StartTracking.ProcessQueryStringCampaign, Sitecore.Analytics">
          <patch:attribute name="type">YOURNAMESPACE.Analytics.Pipelines.StartTracking.ProcessQueryStringCampaignEx, YOURNAMESPACE.Analytics</patch:attribute>
        </processor>
      </startTracking>
    </pipelines>

BillCacy

Set-Location master:

function Get-ItemBasedOnTemplate {
    param(
        [string]$TemplateId
    )

    $queue = New-Object System.Collections.Queue
    $processedLookup = New-Object System.Collections.Generic.HashSet[string]
    if(-not(Test-Path -Path "master:$($TemplateId)")) { return }