Rocketeer quest Gamebreaking bug

So I’ve recently SPOILER reached the point where you prepare for the Talmberk siege. Anyway, when I found out that I need to go to Konrad Kyeser to move the main quest forward, I encountered a bug. When I try to speak to Urban, the doorkeeper of Konrad’s mansion, he shouts at me (because I haven’t returned st. Procopius’ bones where they belong as i forgot about that) and then I get an infinite black loading screen. I’m not asking for a workaround, I really don’t want to kill any of the npc or stuff like that…I also know that other have encountered this glitch before. So, is there anything at all that i can do or do i have to wait for some sort of patch to come by that’ll repair the game? I’d really like to finish it soon and see how the story goes…