SQL Error when trying to delete a record

Hello there people and Microsoft Dynamics CRM experts, today we had this error when trying to delete an user record. Can somebody orientate us what to check or where could be the issue in order to find a solution? Thank you so much!

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=7.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: System.Web.HttpUnhandledException: Microsoft Dynamics CRM has experienced an error. Reference number for administrators or support: #69AF9CD1Detail:

<OrganizationServiceFault xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/xrm/2011/Contracts">

  <ErrorCode>-2147220970</ErrorCode>

  <ErrorDetails xmlns:d2p1="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />

  <Message>System.Web.HttpUnhandledException: Microsoft Dynamics CRM has experienced an error. Reference number for administrators or support: #69AF9CD1</Message>

  <Timestamp>2016-10-12T19:00:33.7440701Z</Timestamp>

  <InnerFault>

    <ErrorCode>-2147204784</ErrorCode>

    <ErrorDetails xmlns:d3p1="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />

    <Message>Generic SQL error.</Message>

    <Timestamp>2016-10-12T19:00:33.7440701Z</Timestamp>

    <InnerFault i:nil="true" />

    <TraceText i:nil="true" />

  </InnerFault>

  <TraceText i:nil="true" />

</OrganizationServiceFault>