System.NullReferenceException: Object reference not set to a

System.NullReferenceException: Object reference not set to an instance of an object.

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.] ASP.usrctrls_businessunitselector_ascx.get_BUDDLText() in d:\Intranet\myAsmara\UsrCtrls\BusinessUnitSelector.ascx:47 massters.SetContent(String commandName) in d:\Intranet\myAsmara\UsrCtrls\EditMasters.aspx.cs:542 massters.BUDDL_SelectionIndexChanged(Object sender, EventArgs e) in d:\Intranet\myAsmara\UsrCtrls\EditMasters.aspx.cs:73 UsrCtrls_Businessretrieve.OnBubbleSelectionChanged(EventArgs e) in d:\Intranet\myAsmara\UsrCtrls\Businessretrieve.ascx.cs:72 UsrCtrls_Businessretrieve.BURETDDL_SelectedIndexChanged(Object sender, EventArgs e) in d:\Intranet\myAsmara\UsrCtrls\Businessretrieve.ascx.cs:92 System.EventHandler.Invoke(Object sender, EventArgs e) +0

get Line 46: { Line 47: return BUDDL.SelectedItem.Text; Line 48: } Line 49: set