diff --git a/PROMS/Volian.Controls.Library/DisplayRO.cs b/PROMS/Volian.Controls.Library/DisplayRO.cs
index a1699b8e..dd1268de 100644
--- a/PROMS/Volian.Controls.Library/DisplayRO.cs
+++ b/PROMS/Volian.Controls.Library/DisplayRO.cs
@@ -793,6 +793,11 @@ namespace Volian.Controls.Library
 				ROFSTLookup.rochild roch = (ROFSTLookup.rochild)obj;
 				_SelectedRoidBeforeRoEditor = roch.roid;
 				string args = "\"" + _MyROFST.MyRODb.FolderPath + "\" " + roch.roid.ToLower();
+				if (!Directory.Exists(_MyROFST.MyRODb.FolderPath))
+				{
+					MessageBox.Show(string.Format("RO Database directory does not exist: {0}", _MyROFST.MyRODb.FolderPath));
+					return;
+				}
 				System.Diagnostics.Process.Start(roapp, args);
 			}
 		}