The diff solves the issue:
https://linear.app/comm/issue/ENG-1168/thread-menu-is-available-for-pending-threads-and-crashes-the-app
Is prevents rendering thread menu (the one on the right of top thread bar) when thread is pending.

Create pending sidebar (or thread by writing to the new user). The menu is not displayed now, and it's not possible to crash the app by launching any thread settings modal)