I restarted the game from the beginning after the release of the 1.4.1 patch, it is more fluid and loads the textures in HD, but arrived at the pestilence mission to merhojed ,the game crashes after the dialogue with the bandit held prisoner, with the written KCD has stopped working.
try change graphics details on low,worked for me
That did not help me.
Maybe try more times, for me worked, sorry 
I sent a complaint to the warhorse studios. They know about this problem now.
I’ll try as i can, but i doubt it, because i’ve already tried decreasing some details
Spiel stürzt bei dieser Quest auch ab wenn man abwartet bis die Seuche abgeklungen ist. Nach dem warten war es das dann. Es ist egal wie man diese Seuchenquest spielt, KCD stürzt ab! Der Bandit, Stroh, oder das abwarten der Seuche… es stürzt ab!
I don’t know if it’s the same segment, but whenever i’d try and talk to straw, by walking into his house, the game would cut to go to a cinematic scene, but before it even does, it crashes with that same error you mentioned.
WH acknowledged this bug on Twitter. They are working on it
There is A way around it Just dont talk to the bandit pickpocket or knock him out and take the paper from him and leave the rest should be fine from what i understood from other posts