You should make a forum specifically for bug reports.
Please enter your class: 77777777777777777777777777777777777777777
enter
bam, crash.
BTW, I did this because I was pissed that I couldn't type "x" to go back to the previous screen like in majormud. You should also change the prompt to
Please select your class [1-15 or 'x' to exit]:
Yeah, saw that this morning and fixed it before I left. ;)