title: Sitecore.Analytics.Exceptions.ContactLockException while merging contacts
body: <p>I am using Sitecore 8.0 update 5, While I try to Identify the contact using </p>
  
  <pre><code>Tracker.Current.Session.Identify(userKey);
  </code></pre>
  
  <p>I get the error </p>
  
  <blockquote>
    <p>Sitecore.Analytics.Exceptions.ContactLockException</p>
  </blockquote>
  
  <p>Adding the whole stack trace below</p>
  
  <pre><code>Exception: Sitecore.Analytics.Exceptions.ContactLockException
  Message: Contact 1cd840a6-f367-4b5f-9df1-74240a03fd29 could not be locked in the XDB.
  Source: Sitecore.Analytics
     at Sitecore.Analytics.Tracking.StandardSession.Identify(String userName)
     at Test.Client.Common.Utilities.AnalyticsHelper.MergeContacts(String userKey)
  </code></pre>