Hello,
I have read about other people experiencing the same bug that I am having at the end of the Ivlis cave when you step into the portal and the game crashes. I have reinstalled the game a few times from GOG and have both IRmgarde and Vlad in party. I wouldn't mind reinstalling and restarting the game but am not sure if that would solve it. I read a post detailing a fix for the problem previously but the link to the patch is old and is not working anymore.

Tbank you

I have never had this problem so I don't know what to advise.
You could post a link to the relevant save game, maybe someone can see what is wrong.