Alerting Engine event log error since 8.5.1 upgrade

Since the upgrade to 8.5.1, the SolarWinds.Net event log for the AlteringEngine shows the following error every five seconds:

2007-12-24 08:19:55,250 [MainTaskThread] ERROR All - Error in SetupMainDBConnection System.NullReferenceException: Object reference not set to an instance of an object.
   at System.Data.SqlClient.SqlCommand.Unprepare(Boolean isClosing)
   at System.Data.SqlClient.SqlInternalConnectionTds.ClearPreparedCommands()
   at System.Data.SqlClient.SqlInternalConnection.CloseConnection(DbConnection owningObject, DbConnectionFactory connectionFactory)
   at System.Data.SqlClient.SqlConnection.Close()
   at System.Data.SqlClient.SqlConnection.Dispose(Boolean disposing)
   at System.ComponentModel.Component.Dispose()
   at AlertingEngine.SWAlertingEngine.SetupMainDBConnection()

Does anyone know how to resolve this?

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aLTeReGo

Have you installed SP2 for 8.5.1?

WendyD

The person who works with me indicated that he had; however, I cannot confirm as he is off this week. Is there a way I can tell, maybe by a dll version, date or something?

aLTeReGo

If you're unsure no harm can come from reapplying the service pack.

WendyD

Unfortunately, to do this, I would have to wait until next month during our maintenance window, as it would affect our customers. But thank you for the tip.