diff --git a/PROMS/Volian.Controls.Library/vlnTreeView.cs b/PROMS/Volian.Controls.Library/vlnTreeView.cs
index 1bcf981d..f790684d 100644
--- a/PROMS/Volian.Controls.Library/vlnTreeView.cs
+++ b/PROMS/Volian.Controls.Library/vlnTreeView.cs
@@ -3728,6 +3728,10 @@ namespace Volian.Controls.Library
 			{
 				try
 				{
+					// B2021-006: dragging text from Microsoft Word onto the tree view was crashing PROMS
+					//	This included dragging text from the Word doc editor within PROMS. Check object type:
+					Object tmp = datobj.GetData(s);
+					if (!(tmp is TreeNode)) return null;
 					return (TreeNode)datobj.GetData(s);
 				}
 				catch (Exception ex)