diff --git a/PROMS/DataLoader/Formats.cs b/PROMS/DataLoader/Formats.cs
index bc12d73a..1a0c13bf 100644
--- a/PROMS/DataLoader/Formats.cs
+++ b/PROMS/DataLoader/Formats.cs
@@ -214,7 +214,14 @@ namespace DataLoader
 				if (format.IndexOf(' ') > -1)   // will have spaces if it's a user format
 				{
 					string part1 = format.Substring(0, format.IndexOf(' '));
-					string part2 = format.Substring(format.LastIndexOf(' ') + 1, 2);
+					string part2 = null;
+					try
+					{
+						part2 = format.Substring(format.LastIndexOf(' ') + 1, 2);
+					}
+					catch
+					{
+					}
 					format = part1 + part2;
 
 					// get the parent format's id (for example, AEP for AEP00).