Error 4834 Invalid Ticket Id when Event insertRecords when Contacts email already exists

Error 4834 Invalid Ticket Id when Event insertRecords when Contacts email already exists

When inserting a new Event, and the user email already exists in Contacts, the following error is received. This is the case when pulling the CONTACTID for the email submitted or not.

<?xml version="1.0" encoding="UTF-8" ?>
<response uri="/crm/private/xml/Events/insertRecords"><error><code>4834</code><message>Invalid Ticket Id</message></error></response>


Events are entered correctly, without error, if the contact email does not exist.