I've been able to resolve this crash.
My wife was the problem.
Long time ago, during the 1.4.1 patch she was somehow "cloned". I created a clan party with her as a leader and somehow she appeared in my own party in the same time. So there were two instances of her- one was leading her own party and other was in my party. It worked fine in 1.4.1.
In 1.4.3, when my wife's clone that was leading her own party got captured and afterwards escaped she never reappeared on the map and after her capture my game would crash when I click on the clan interface button. Her clone was still in my party though.
I manage to resolve the crash by talking to the clone that was in my party and asking her to join my party (lol). After that I could click on clan interface button with no crash and everything seems fine now.
Really interesting bug I must say.