Crash bug in Miguel font

[evanb]

This line of text, entered by one of our users, crashes SAPI with an exception that we can't manage to catch in C#.

Si usted tiene alguna pregunta por favor llame a la escuela o Griselda Flores en 555-5555 Gracias por su apoyo!!

The offending construct is the phone number followed by "Gracias". Adding a period or linebreak between them makes the problem go away. We have a fairly old version of Miguel, but this is apparently still present in the current version; I can crash your Web demo with it.