*** empty log message ***

diff --git a/MText.cs b/MText.cs
index 45d711b..fcf4a58 100644 (file)
--- a/MText.cs
+++ b/MText.cs
@@ -1343,6 +1343,8 @@ namespace M17N.Core
            Console.Write (")");
            if (newline)
              Console.WriteLine ();
+           if (Length <= 0)
+             throw new Exception ("Invalid interval length");
          }
       }