1 files changed, 13 insertions, 4 deletions
diff --git a/src/guitools.cs b/src/guitools.cs
index 8828941..bdc9e8a 100755
--- a/src/guitools.cs
+++ b/src/guitools.cs
@@ -306,10 +306,19 @@ namespace gfax {
 			bool is_sorted = ((Gtk.ListStore)model).GetSortColumnId (out col, out sort);
 			if(!is_sorted)
 				return 0;
-			
-			DateTime dateA = (DateTime)model.GetValue (a, col);
-			DateTime dateB = (DateTime)model.GetValue (b, col);
-			
+
+			object oA = model.GetValue (a, col);
+			object oB = model.GetValue (b, col);
+
+			if(oB == null)
+				return 1;
+
+			if(oA == null)
+				return -1;
+
+			DateTime dateA = (DateTime)oA;
+			DateTime dateB = (DateTime)oB;
+
 			return dateA.CompareTo(dateB);
 		}