Does anybody know why I get a lot of these errors in my Altiris NS Log Viewer and how to resolve it?

Process: w3wp.exe (10020)
Module: AltirisNativeHelper.dll
Source: Altiris.ClientTask.Web.GetClientTaskServers.Page_Load
Text:

An exception occurred while attempting to get Client Task Server list ( Unhandled exception. Type=System.Data.SqlTypes.SqlNullValueException Msg=Data is Null. This method or property cannot be called on Null values. Src=System.Data StackTrace= at System.Data.SqlTypes.SqlString.get_Value() at System.Data.SqlClient.SqlDataReader.GetString(Int32 i) at Altiris.ClientTask.Web.GetClientTaskServers.LocateServersBasedOnSubnet(Guid resourceGuid) at Altiris.ClientTask.Web.GetClientTaskServers.Page_Load(Object sender, EventArgs e) )