I meant no ruling party. The game continues to crash very early even if a party is elected at start. Furthermore, it is imposiible to make Poland a democracy, as the constitution changing event does not fire even with all political reforms enabled. So the point is, choosing a party actually leads to a crash in January/February. And if I don't choose one in few seconds after the game loads, game crashes on the first day even while still at pause.
I don't know what to say. Try reinstalling. (And pick a ruling party while the game is still paused on Jan 1, 1919)