[BullseyeHawk]

Probably using some uni-code langauge that is not supported by your computer. Something inside the script is the problem as I suspect with the code. Tracing back this issue is very hard. You could however, limit usage of characters to only enligsh in OnPlayerTalk, tho it's not really recommanded.

I am actually not-aware if this is a "exploit", for that. We need a beta-tester to confirm.