Hi mentor54,
Is this a consistent crash, or did it only happen once? If you have a saved game prior to the crash, please send it to us and I'll see if I can reproduce it. The saves can be found in C:\Users\<Your Username>\Saved Games\Tyranny, although since you appear to be playing in French it's possible your directory path will differ. If you have any recollection of the choices you selected in the conversation, that would be helpful as well.
Thanks,
Dan