When I try to open private browsing brave suddenly crashes.

There is now message when it closes. It just exit like I clicked the X. I need to tell you that; I copied and pasted the default user data from another (chrome based) browser to brave’s default user data. I’m mostly happy with the result. I got to move all my important data this way. I really don’t want to completely reset it. I just want to deal with the problem directly. Which probably means fixing/replacing the specific broken user data file(s)/folder(s). I’m just not sure if this is the problem. And if it is I don’t know which file(s)/folder(s) are broken.