diff --git a/PROMS/Volian.Controls.Library/DisplayReports.cs b/PROMS/Volian.Controls.Library/DisplayReports.cs
index 5f11e78c..86789880 100644
--- a/PROMS/Volian.Controls.Library/DisplayReports.cs
+++ b/PROMS/Volian.Controls.Library/DisplayReports.cs
@@ -217,6 +217,7 @@ namespace Volian.Controls.Library
 		private void BuildCheckedROsList()
 		{
 			lstCheckedROs.Clear();
+			if (advTreeRO.Nodes.Count == 0) return;
 			DevComponents.AdvTree.Node node = advTreeRO.Nodes[0];
 			if (node.Checked) // top node (all Referenced Objects) selected
 				lstCheckedROs.Add(node.Tag);